add Containerfile + CI build

.forgejo/workflows/docker-build.yaml

@@ -0,0 +1,19 @@
+on:
+  push:
+    branches:
+      - 'main'
+jobs:
+  build-container:
+    runs-on: docker
+    container:
+      image: library/docker:dind
+    steps:
+      - run: apk add --no-cache nodejs git
+      - name: login to container registry
+        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login --username "${GITHUB_ACTOR}" --password-stdin git.janky.solutions
+      - name: build container
+        uses: docker/build-push-action@v4
+        with:
+          file: Containerfile
+          tags: git.janky.solutions/finn/s3-caching-proxy:latest
+          push: true

Containerfile

@@ -0,0 +1,9 @@
+FROM library/golang:1.20 as build
+ADD * /go/caching-proxy/
+WORKDIR /go/caching-proxy
+ARG GOPROXY=direct
+RUN CGO_ENABLED=0 go build .
+
+FROM gcr.io/distroless/base-debian11
+COPY --from=build /go/caching-proxy/caching-proxy /caching-proxy
+ENTRYPOINT ["/caching-proxy"]