Add action for publishing Docker image builds

.github/workflows/docker.yml

@@ -0,0 +1,39 @@
+name: 'Publish image builds to Docker Hub'
+on:
+  push:
+    tags: [ 'v*' ]
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout latest
+        uses: actions/checkout@v4
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: seart
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - id: meta
+        name: Extract metadata for Docker
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const patch = context.ref.substring(11)
+            const parts = patch.split('.')
+            const minor = `${parts[0]}.${parts[1]}`
+            const major = parts[0]
+            core.setOutput('tag-patch', patch)
+            core.setOutput('tag-minor', minor)
+            core.setOutput('tag-major', major)
+      - name: Build and push image
+        uses: docker/build-push-action@v5
+        with:
+          push: true
+          tags: |
+            seart/${{ context.repo.repo }}:latest
+            seart/${{ context.repo.repo }}:${{ steps.meta.outputs.tag-major }}
+            seart/${{ context.repo.repo }}:${{ steps.meta.outputs.tag-minor }}
+            seart/${{ context.repo.repo }}:${{ steps.meta.outputs.tag-patch }}