Add Gitea Action workflow

.gitea/workflows/build.yaml

@@ -0,0 +1,36 @@
+name: Build
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+
+    - name: Checkout code
+      uses: actions/checkout@v3
+
+    - name: Extract version from tag reference
+      shell: bash
+      run: echo "AKKOMA_VERSION=${GITHUB_REF_NAME#refs/tags/v}" >> $GITHUB_ENV
+
+    - name: Install Docker
+      run: curl -fsSL https://get.docker.com | sh
+
+    - name: Configure Docker credentials
+      uses: docker/login-action@v2
+      with:
+        registry: git.quent1.fr
+        username: ${{ gitea.actor }}
+        password: ${{ secrets.REGISTRY_PASSWORD }}
+
+    - name: Build and push Docker image
+      uses: docker/build-push-action@v4
+      with:
+        context: .
+        file: ./Dockerfile
+        push: true
+        tags: git.quent1.fr/quent1/akkoma:${{ env.AKKOMA_VERSION }}