Set up a basic CI build

.github/workflows/test.yml

@@ -0,0 +1,49 @@
+name: 'Test'
+on:
+  pull_request:
+    branches: [ $default-branch ]
+  workflow_dispatch:
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+
+  integration-tests:
+    name: "Integration tests"
+    runs-on: [self-hosted, linux, normal]
+    steps:
+      - name: 'Check out code'
+        uses: actions/checkout@v4
+        with:
+          token: ${{ secrets.JENKINS_GITHUB_PAT }}
+          submodules: recursive
+
+      - name: "Set up nightly Rust" # https://github.com/rust-lang/rustup/issues/3409
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: nightly-2024-08-28
+
+      - name: 'Set up tree for rust dependency'
+        run: make setup
+
+      - name: 'Cache smir_pretty and rustc'
+        uses: Swatinem/rust-cache@v2
+        with:
+          workspaces: |
+            .
+            deps/rust/src
+          cache-directories: |
+            target
+            deps/rust/src/build
+            deps/rust/src/target
+
+      - name: 'Build smir_pretty and its rustc dependency'
+        run: | # rustc bootstrap checks this and refuses stage 1 in "CI"
+          export GITHUB_ACTIONS="in denial" && \
+          echo "GITHUB_ACTIONS = ${GITHUB_ACTIONS}" && \
+          make build_all
+
+      - name: 'Run smir integration tests'
+        run: |
+          make integration-test

Makefile

@@ -84,3 +84,7 @@ generate_ui_tests:
 	cd "${RUST_SRC}"; ./get_runpass.sh tests/ui > "${RUST_DIR}"/tests_ui_sources
 	-cd "${RUST_SRC}"; ./ui_compiletest.sh "${RUST_SRC}" "${RUST_DIR}"/tests/ui/upstream "${RUST_DIR}"/tests_ui_sources --pass check --force-rerun 2>&1 > "${RUST_DIR}"/tests_ui_upstream.log
 	-cd "${RUST_SRC}"; RUST_BIN="${PWD}"/run.sh ./ui_compiletest.sh "${RUST_SRC}" "${RUST_DIR}"/tests/ui/smir "${RUST_DIR}"/tests_ui_sources --pass check --force-rerun 2>&1 > "${RUST_DIR}"/tests_ui_smir.log
+
+.PHONY: integration-test
+integration-test:
+	@echo "Implement me!"