Move prebuild of Postgres replica to separate workflow

.github/workflows/prebuild_postgres_replica.yml

@@ -0,0 +1,46 @@
+name: Build Postgres Replica Image
+
+on:
+  pull_request:
+    paths:
+      - 'postgres_replica.dockerfile'
+
+jobs:
+  export_variables:
+    runs-on: ubuntu-latest
+
+    outputs:
+      replica_image: ${{ steps.compute_container_registry_name.outputs.CR_NAME }}/postgres_replica:${{ steps.calculate_replica_sha.outputs.REPLICA_SHA }}
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    - name: Compute container registry name
+      id: compute_container_registry_name
+      run: echo "CR_NAME=$(echo ghcr.io/${{ github.repository }} | tr '[:upper:]' '[:lower:]')" >> $GITHUB_OUTPUT
+
+    - name: Calculate SHA256 for postgres_replica.dockerfile
+      id: calculate_replica_sha
+      run: echo "REPLICA_SHA=$(sha256sum postgres_replica.dockerfile | awk '{ print substr($1, 1, 12) }')" >> $GITHUB_OUTPUT
+
+  prebuild_replica:
+    needs: export_variables
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    - name: Log in to GitHub Container Registry
+      uses: docker/login-action@v2
+      with:
+        registry: ghcr.io
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Build and tag replica Docker image
+      run: docker build -f postgres_replica.dockerfile -t ${{ needs.export_variables.outputs.replica_image }} .
+
+    - name: Push replica Docker image
+      run: docker push ${{ needs.export_variables.outputs.replica_image }}

.github/workflows/test.yml

@@ -29,27 +29,6 @@ jobs:
       id: calculate_replica_sha
       run: echo "REPLICA_SHA=$(sha256sum postgres_replica.dockerfile | awk '{ print substr($1, 1, 12) }')" >> $GITHUB_OUTPUT
 
-  prebuild_replica:
-    needs: export_variables
-    runs-on: ubuntu-latest
-
-    steps:
-    - name: Checkout repository
-      uses: actions/checkout@v4
-
-    - name: Log in to GitHub Container Registry
-      uses: docker/login-action@v2
-      with:
-        registry: ghcr.io
-        username: ${{ github.actor }}
-        password: ${{ secrets.GITHUB_TOKEN }}
-
-    - name: Build and tag replica Docker image
-      run: docker build -f postgres_replica.dockerfile -t ${{ needs.export_variables.outputs.replica_image }} .
-
-    - name: Push replica Docker image
-      run: docker push ${{ needs.export_variables.outputs.replica_image }}
-
   rubocop:
     runs-on: ubuntu-latest
 
@@ -70,7 +49,7 @@ jobs:
         run: bundle exec rubocop
 
   rspec:
-    needs: [export_variables, prebuild_replica]
+    needs: [export_variables]
     runs-on: ubuntu-latest
 
     strategy: