adding ci/cd pipeline

.gitea/workflows/docker-build.yml

@@ -0,0 +1,26 @@
+name: Build and Push Docker Container
+on:
+  push:
+    branches:
+      - "main"
+
+jobs:
+  build-and-push:
+    runs-on:
+      - ubuntu-22.04
+    steps:
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          registry: git.kohout-dev.de
+          username: ${{ secrets.USERNAME }}
+          password: ${{ secrets.ACCESS_TOKEN }}
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          push: true
+          tags: "git.kohout-dev.de/crowsnest/crowsnest:${{gitea.sha}},git.kohout-dev.de/crowsnest/crowsnest:latest"