feat: add Dockerfile, Helm chart, Gitea Actions workflow

.gitea/workflows/build.yml

@@ -0,0 +1,44 @@
+name: Build & Push
+
+on:
+  push:
+    branches:
+      - main
+
+env:
+  REGISTRY: git.sebse.de
+  IMAGE: git.sebse.de/sebse/factorio-signal-exporter
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Log in to Gitea Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ secrets.GITEA_USERNAME }}
+          password: ${{ secrets.GITEA_TOKEN }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.IMAGE }}
+          tags: |
+            type=sha,prefix=,format=short
+            type=raw,value=latest
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: ./web
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=registry,ref=${{ env.IMAGE }}:latest
+          cache-to: type=inline