build: fix image tags to actually tag latest on main branch for depen…

…dency images

Before, the latest tag was only added to the metadata when we are on the main branch :
(github.ref == 'refs/heads/main')

Together with the fact that we build the dependency images only when we did not hit
the cache lead to the fact that the latest tag was actually never applied to our
dependency images.

.github/workflows/ci.yml

@@ -82,6 +82,14 @@ jobs:
           cache-from: type=gha,ref=linter-dependencies-image-cache-${{ hashFiles('conanfile.py', 'Dockerfile_linter') }}
           cache-to: type=gha,mode=min,ref=linter-dependencies-image-cache-${{ hashFiles('conanfile.py', 'Dockerfile_linter') }}
 
+      - name: Retag and push existing image if cache hit
+        if: env.CACHE_HIT == 'true'
+        run: |
+          TAGS=(${{ steps.dockerMetadata.outputs.tags }})
+          for TAG in "${TAGS[@]}"; do
+            docker buildx imagetools create --tag $TAG ${{ env.DOCKER_LINTER_DEPENDENCY_IMAGE_NAME }}:${{ env.DIR_HASH }}
+          done
+
   linter:
     name: Build And Run linter
     needs: linterDependencies
@@ -163,6 +171,14 @@ jobs:
           cache-to: type=gha,mode=min,ref=builder-image-cache-${{ hashFiles('conanfile.py', 'Dockerfile') }}
           platforms: linux/amd64,linux/arm64
 
+      - name: Retag and push existing image if cache hit
+        if: env.CACHE_HIT == 'true'
+        run: |
+          TAGS=(${{ steps.dockerMetadata.outputs.tags }})
+          for TAG in "${TAGS[@]}"; do
+            docker buildx imagetools create --tag $TAG ${{ env.DOCKER_DEPENDENCY_IMAGE_NAME }}:${{ env.DIR_HASH }}
+          done
+
   dockerImageUnitTests:
     name: Build Docker Image and Run Unit Tests
     runs-on: ubuntu-latest