Bump docker/build-push-action from 6.7.0 to 6.8.0 (#926)

Bumps
[docker/build-push-action](https://github.com/docker/build-push-action)
from 6.7.0 to 6.8.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/docker/build-push-action/releases">docker/build-push-action's
releases</a>.</em></p>
<blockquote>
<h2>v6.8.0</h2>
<ul>
<li>Bump <code>@​docker/actions-toolkit</code> from 0.37.1 to 0.38.0 in
<a
href="https://redirect.github.com/docker/build-push-action/pull/1230">docker/build-push-action#1230</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/docker/build-push-action/compare/v6.7.0...v6.8.0">https://github.com/docker/build-push-action/compare/v6.7.0...v6.8.0</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="32945a3392"><code>32945a3</code></a>
Merge pull request <a
href="https://redirect.github.com/docker/build-push-action/issues/1230">#1230</a>
from docker/dependabot/npm_and_yarn/docker/actions-t...</li>
<li><a
href="e0fe9cf0f2"><code>e0fe9cf</code></a>
chore: update generated content</li>
<li><a
href="8f1ff6bf9a"><code>8f1ff6b</code></a>
chore(deps): Bump <code>@​docker/actions-toolkit</code> from 0.37.1 to
0.38.0</li>
<li>See full diff in <a
href="5cd11c3a4c...32945a3392">compare
view</a></li>
</ul>
</details>
<br />


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score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=docker/build-push-action&package-manager=github_actions&previous-version=6.7.0&new-version=6.8.0)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

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.github/workflows/publish_docker_image.yml

@@ -48,7 +48,7 @@ jobs:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME_BACKEND }}
 
       - name: Build and push frontend Docker image
-        uses: docker/build-push-action@5cd11c3a4ced054e52742c5fd54dca954e0edd85
+        uses: docker/build-push-action@32945a339266b759abcbdc89316275140b0fc960
         with:
           context: frontend
           push: true
@@ -58,7 +58,7 @@ jobs:
           platforms: linux/amd64
 
       - name: Build and push backend Docker image
-        uses: docker/build-push-action@5cd11c3a4ced054e52742c5fd54dca954e0edd85
+        uses: docker/build-push-action@32945a339266b759abcbdc89316275140b0fc960
         with:
           context: backend
           push: true