Bump docker/build-push-action from 5 to 6 (#125)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 5 to 6.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v5...v6)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/image-build.yml

@@ -12,7 +12,7 @@ jobs:
         uses: docker/setup-buildx-action@v3
 
       - name: Build container image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           push: false

.github/workflows/image-push-master.yml

@@ -27,7 +27,7 @@ jobs:
 
       - name: Push container image
         if: ${{ github.repository_owner == env.image-push-owner }}
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           push: true

.github/workflows/image-push-release.yml

@@ -34,7 +34,7 @@ jobs:
 
       - name: Push container image
         if: ${{ github.repository_owner == env.image-push-owner }}
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           push: true