Add docker image workflow

.gitea/workflows/docker.yml

@@ -0,0 +1,42 @@
+name: Build and Push Docker Image
+
+on:
+  push:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Login to Registry
+        uses: docker/login-action@v2
+        with:
+          registry: gitea.spilum.net
+          username: ${{ secrets.REGISTRY_USER }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+
+      - name: Build Docker Image
+        env:
+          BRANCH_NAME: ${{ github.ref_name }}
+          SHORT_HASH: ${{ github.sha }}
+        run: |
+          # Build the image with the commit hash tag
+          docker build --build-arg BUILD_IDENTIFIER=${SHORT_HASH:0:5} -t gitea.spilum.net/spilum.net/mtf-nlp:${BRANCH_NAME}-${SHORT_HASH:0:5} .
+
+          # Tag the same image as "latest"
+          docker tag gitea.spilum.net/spilum.net/mtf-nlp:${BRANCH_NAME}-${SHORT_HASH:0:5} gitea.spilum.net/spilum.net/mtf-nlp:${BRANCH_NAME}-latest
+
+      - name: Push Docker Image
+        env:
+          BRANCH_NAME: ${{ github.ref_name }}
+          SHORT_HASH: ${{ github.sha }}
+        run: |
+          docker push gitea.spilum.net/spilum.net/mtf-nlp:${BRANCH_NAME}-${SHORT_HASH:0:5}
+          docker push gitea.spilum.net/spilum.net/mtf-nlp:${BRANCH_NAME}-latest
+
+      - name: Log out from registry
+        if: always()
+        run: docker logout gitea.spilum.net