chore(deps): bump docker/build-push-action in /.github/workflows

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 6 to 7.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v6...v7)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/docker-image-factory.yml

@@ -51,7 +51,7 @@ jobs:
           echo "tag=$TAG" >> $GITHUB_OUTPUT
 
       - name: Build and push Docker image - cuos-image-factory
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: ./
           file: ./image-factory/Dockerfile

.github/workflows/docker-installer-factory.yml

@@ -50,7 +50,7 @@ jobs:
           echo "tag=$TAG" >> $GITHUB_OUTPUT
 
       - name: Build and push Docker image - cuos-installer-factory
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: ./installer-factory
           file: ./installer-factory/Dockerfile

.github/workflows/docker-system.yml

@@ -50,7 +50,7 @@ jobs:
           echo "tag=$TAG" >> $GITHUB_OUTPUT
 
       - name: Build and push Docker image - cuos-system
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: ./system
           push: true
@@ -66,7 +66,7 @@ jobs:
           cache-to: type=registry,ref=ghcr.io/${{ github.repository_owner }}/cuos-system:buildcache,mode=max
 
       - name: Build and push Docker image - cuos-system-rpi-arm64
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: ./system
           file: ./system/Dockerfile.rpi-arm64
@@ -83,7 +83,7 @@ jobs:
           cache-to: type=registry,ref=ghcr.io/${{ github.repository_owner }}/cuos-system-rpi-arm64:buildcache,mode=max
 
       - name: Build and push Docker image - cuos-system-lxc
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: ./system
           file: ./system/Dockerfile.lxc

.github/workflows/docker-updater.yml

@@ -50,7 +50,7 @@ jobs:
           echo "tag=$TAG" >> $GITHUB_OUTPUT
 
       - name: Build and push Docker image - cuos-updater
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: ./updater
           push: true