CI: push :latest when commiting to the main branch

Also update ghaction-version-gen to 0.7.

Author: lpenz

.github/workflows/ci.yml

@@ -25,15 +25,14 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - id: version
-        uses: docker://lpenz/ghaction-version-gen:0.4
+        uses: docker://lpenz/ghaction-version-gen:0.7
       - uses: docker/setup-buildx-action@v1
       - uses: docker/login-action@v1
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
       - uses: docker/build-push-action@v2
-        if: steps.version.outputs.version_tagged != ''
         with:
-          push: true
-          tags: ${{ github.repository }}:${{ steps.version.outputs.version_tagged }}
+          push: ${{ steps.version.outputs.version_docker_ci != 'null' }}
+          tags: ${{ github.repository }}:${{ steps.version.outputs.version_docker_ci }}