CI: introduce a composite workflow for docker image handling

.github/actions/push-container/action.yml

@@ -0,0 +1,32 @@
+name: Push Container
+description: Push a Container
+
+inputs:
+  registry:
+    description: Server address of Docker registry.
+    required: true
+  username:
+    description: Username used to login.
+    required: true
+  password:
+    description: Password or PAT used to login.
+    required: true
+
+  name:
+    description: The name of the image to push.
+    required: true
+  tag:
+    description: The tag of the image to push.
+    required: true
+
+runs:
+  using: "composite"
+  steps:
+    - uses: docker/login-action@v2
+      with:
+        registry: ${{ inputs.registry }}
+        username: ${{ inputs.username }}
+        password: ${{ inputs.password }}
+
+    - run: |
+        docker push ${{ inputs.registry }}/${{ inputs.name }}:${{ inputs.tag }}

.github/workflows/llvm-project-epoch-one.yml

@@ -27,15 +27,12 @@ jobs:
       - name: Test statically linked clang
         run: bash ci/test-clang.sh
 
-      - name: Login to ghcr.io
+
+      - uses: ./.github/actions/push-container
         if: ${{ github.repository_owner == 'ClangBuiltLinux' && github.event_name != 'pull_request' && github.ref_name == 'main' }}
-        uses: docker/login-action@v2
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
-
-      - name: Push image to ghcr.io
-        if: ${{ github.repository_owner == 'ClangBuiltLinux' && github.event_name != 'pull_request' && github.ref_name == 'main' }}
-        run: |
-          docker push ghcr.io/clangbuiltlinux/llvm-project:stage2
+          name: clangbuiltlinux/llvm-project
+          tag: stage2

.github/workflows/llvm-project-epoch-two.yml

@@ -27,15 +27,12 @@ jobs:
       - name: Test statically linked clang
         run: bash ci/test-clang.sh
 
-      - name: Login to ghcr.io
+
+      - uses: ./.github/actions/push-container
         if: ${{ github.repository_owner == 'ClangBuiltLinux' && github.event_name != 'pull_request' && github.ref_name == 'main' }}
-        uses: docker/login-action@v2
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
-
-      - name: Push image to ghcr.io
-        if: ${{ github.repository_owner == 'ClangBuiltLinux' && github.event_name != 'pull_request' && github.ref_name == 'main' }}
-        run: |
-          docker push ghcr.io/clangbuiltlinux/llvm-project:stage2
+          name: clangbuiltlinux/llvm-project
+          tag: stage2