ci: export unique arch list generated

Author: SergioRibera

.github/workflows/release.yml

@@ -58,6 +58,7 @@ jobs:
     runs-on: ubuntu-latest
     outputs:
       matrix: ${{ steps.generate-matrix.outputs.matrix }}
+      arch_list: ${{ steps.generate-arch-list.outputs.arch_list }}
     steps:
       - uses: actions/checkout@v4
 
@@ -77,7 +78,12 @@ jobs:
           echo "$MATRIX"
           echo "matrix=$MATRIX" >> $GITHUB_OUTPUT
 
-          ARCH_LIST=$(echo "$MATRIX" | jq -r '.[].arch' | jq -R -s -c 'split("\n") | map(select(. != ""))')
+      - name: Generate Arch List
+        id: generate-arch-list
+        run: |
+          ARCH_LIST=$(nix run .#archs --quiet)
+          echo "Generated Archs:"
+          echo "$ARCH_LIST"
           echo "arch_list=$ARCH_LIST" >> $GITHUB_OUTPUT
 
   build:
@@ -173,7 +179,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        include: ${{ fromJson(needs.generate-matrix.outputs.matrix) }}
+        include: ${{ fromJson(needs.generate-matrix.outputs.arch_list) }}
     steps:
       - uses: actions/checkout@v4
       - name: Set Repository Lowercase
@@ -193,16 +199,12 @@ jobs:
           docker load < ./result
           docker tag grhooks:${{ env.VERSION }} ghcr.io/${{ env.REPOSITORY }}/grhooks:${{ matrix.arch }}
 
-      - name: Create and push unified manifest
-        run: |
-          docker manifest create ghcr.io/${{ env.REPOSITORY }}/grhooks:${{ env.VERSION }} \
-            --amend ghcr.io/${{ env.REPOSITORY }}/grhooks:${{ matrix.arch }}
-
   docker-publish:
     runs-on: ubuntu-latest
     needs: [setup, generate-matrix, docker-build]
     env:
       VERSION: ${{ needs.setup.outputs.version }}
+      ARCHS: ${{ needs.generate-matrix.outputs.arch_list }}
     steps:
       - name: Log in to GHCR
         uses: docker/login-action@v3
@@ -216,12 +218,11 @@ jobs:
       - name: Create and push manifest
         run: |
           IMAGE=ghcr.io/${{ env.REPOSITORY }}/grhooks:${{ env.VERSION }}
-          ARCHS='${{ needs.generate-matrix.outputs.arch_list }}'
 
           echo "Creating manifest for architectures: $ARCHS"
 
           manifest_args=""
-          for arch in $(echo "$ARCHS" | jq -r '.[]'); do
+          for arch in $(echo "$ARCHS" | jq -r '.[].arch'); do
             manifest_args="$manifest_args --amend ghcr.io/${{ env.REPOSITORY }}/grhooks:$arch"
           done
 

flake.nix

@@ -108,6 +108,9 @@
               else ".#toTarball";
           }) formats
         ) architectures));
+
+        archList = uniqueBy (i: i.arch) architectures;
+        generatedArchJson = builtins.toJSON archList;
       in
       {
         devShells = lib.listToAttrs (map ({ arch, os, target, ... }: {
@@ -128,9 +131,7 @@
         }) architectures)) // (pkgs.lib.listToAttrs (map ({arch, ...} @ args: {
           name = "image-${arch}";
           value = containerPkg args;
-        })
-            (uniqueBy (i: i.arch) architectures)
-        ));
+        }) archList));
 
         apps = {
           help = {
@@ -163,6 +164,14 @@
               echo '${generatedMatrixJson}'
             '');
           };
+
+          archs = {
+            type = "app";
+            program = toString (pkgs.writeScript "generate-arch-list" ''
+              #!/bin/sh
+              echo '${generatedArchJson}'
+            '');
+          };
         };
 
         bundlers = let