ci: install mold as the linker

May or may not fix OOMs in CI: https://github.com/paradigmxyz/reth/actions/runs/12828782069/job/35773552927?pr=13841

.github/workflows/book.yml

@@ -57,6 +57,7 @@ jobs:
     timeout-minutes: 60
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: dtolnay/rust-toolchain@nightly
       - name: Install mdbook
         run: |
@@ -81,9 +82,7 @@ jobs:
         run: cargo docs --exclude "example-*"
         env:
           # Keep in sync with ./ci.yml:jobs.docs
-          RUSTDOCFLAGS:
-            --cfg docsrs --show-type-layout --generate-link-to-definition --enable-index-page
-            -Zunstable-options
+          RUSTDOCFLAGS: --cfg docsrs --show-type-layout --generate-link-to-definition --enable-index-page -Zunstable-options
 
       - name: Move docs to book folder
         run: |

.github/workflows/compact.yml

@@ -1,12 +1,11 @@
 # Ensures that `Compact` codec changes are backwards compatible.
-# 
+#
 # 1) checkout `main`
 # 2) randomly generate and serialize to disk many different type vectors with `Compact` (eg. Header, Transaction, etc)
 # 3) checkout `pr`
 # 4) deserialize previously generated test vectors
 
 on:
-
   pull_request:
   merge_group:
   push:
@@ -26,6 +25,7 @@ jobs:
           - cargo run --bin reth --features "dev"
           - cargo run --bin op-reth --features "optimism dev" --manifest-path crates/optimism/bin/Cargo.toml
     steps:
+      - uses: rui314/setup-mold@v1
       - uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
         with:

.github/workflows/docker-git.yml

@@ -26,6 +26,7 @@ jobs:
       contents: read
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
         with:

.github/workflows/docker.yml

@@ -25,6 +25,7 @@ jobs:
       contents: read
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
         with:

.github/workflows/integration.yml

@@ -29,6 +29,7 @@ jobs:
     timeout-minutes: 60
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: dtolnay/rust-toolchain@stable
       - name: Install Geth
         run: .github/assets/install_geth.sh

.github/workflows/lint.yml

@@ -28,6 +28,7 @@ jobs:
             features: ""
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: dtolnay/rust-toolchain@clippy
         with:
           toolchain: nightly-2025-01-16
@@ -50,6 +51,7 @@ jobs:
     timeout-minutes: 30
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: dtolnay/rust-toolchain@nightly
         with:
           toolchain: nightly-2025-01-16
@@ -66,6 +68,7 @@ jobs:
     timeout-minutes: 30
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: dtolnay/rust-toolchain@stable
         with:
           target: wasm32-wasip1
@@ -84,6 +87,7 @@ jobs:
     timeout-minutes: 60
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: dtolnay/rust-toolchain@stable
         with:
           target: riscv32imac-unknown-none-elf
@@ -100,6 +104,7 @@ jobs:
     timeout-minutes: 30
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: dtolnay/rust-toolchain@stable
       - uses: taiki-e/install-action@cargo-hack
       - uses: Swatinem/rust-cache@v2
@@ -121,6 +126,7 @@ jobs:
             network: optimism
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: "1.82" # MSRV
@@ -137,6 +143,7 @@ jobs:
     timeout-minutes: 30
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: dtolnay/rust-toolchain@nightly
       - uses: Swatinem/rust-cache@v2
         with:
@@ -153,6 +160,7 @@ jobs:
     timeout-minutes: 30
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: dtolnay/rust-toolchain@nightly
         with:
           components: rustfmt
@@ -167,6 +175,7 @@ jobs:
     timeout-minutes: 30
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: dtolnay/rust-toolchain@nightly
       - uses: Swatinem/rust-cache@v2
         with:
@@ -180,10 +189,8 @@ jobs:
     timeout-minutes: 30
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: dtolnay/rust-toolchain@nightly
-      - uses: dtolnay/rust-toolchain@master
-        with:
-          toolchain: "1.82" # MSRV
       - uses: Swatinem/rust-cache@v2
         with:
           cache-on-failure: true
@@ -218,6 +225,7 @@ jobs:
     timeout-minutes: 30
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: dtolnay/rust-toolchain@stable
       - name: Ensure no arbitrary or proptest dependency on default build
         run: cargo tree --package reth -e=features,no-dev | grep -Eq "arbitrary|proptest" && exit 1 || exit 0
@@ -229,6 +237,7 @@ jobs:
     timeout-minutes: 30
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: dtolnay/rust-toolchain@clippy
       - uses: Swatinem/rust-cache@v2
         with:

.github/workflows/prepare-reth.yml

@@ -31,6 +31,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - run: mkdir artifacts
+      - uses: rui314/setup-mold@v1
       - uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
         with:

.github/workflows/release.yml

@@ -54,6 +54,7 @@ jobs:
             binary: op-reth
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: dtolnay/rust-toolchain@stable
         with:
           target: ${{ matrix.configs.target }}

.github/workflows/stage.yml

@@ -6,7 +6,7 @@ on:
   pull_request:
   merge_group:
   push:
-    branches: [ main ]
+    branches: [main]
 
 env:
   CARGO_TERM_COLOR: always
@@ -30,6 +30,7 @@ jobs:
     timeout-minutes: 60
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
         with:

.github/workflows/sync.yml

@@ -38,6 +38,7 @@ jobs:
             unwind-target: "0x118a6e922a8c6cab221fc5adfe5056d2b72d58c6580e9c5629de55299e2cf8de"
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
         with:

.github/workflows/unit.yml

@@ -49,6 +49,7 @@ jobs:
     timeout-minutes: 30
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
         with:
@@ -84,6 +85,7 @@ jobs:
           path: testing/ef-tests/ethereum-tests
           submodules: recursive
           fetch-depth: 1
+      - uses: rui314/setup-mold@v1
       - uses: dtolnay/rust-toolchain@stable
       - uses: taiki-e/install-action@nextest
       - uses: Swatinem/rust-cache@v2
@@ -103,6 +105,7 @@ jobs:
         network: ["ethereum", "optimism"]
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
         with:

.github/workflows/windows.yml

@@ -16,6 +16,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: dtolnay/rust-toolchain@stable
         with:
           target: x86_64-pc-windows-gnu
@@ -34,6 +35,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: dtolnay/rust-toolchain@stable
         with:
           target: x86_64-pc-windows-gnu