docker/ci: fix building for branches

Author: manio

.github/workflows/docker-image.yml

@@ -17,7 +17,9 @@ jobs:
     - name: Build and push
       uses: docker/build-push-action@v6
       with:
-        tags: manio/aa-proxy-rs:latest
+        build-args: |
+          GH_BRANCH=${{ github.ref_name }}
+        tags: manio/aa-proxy-rs:${{ github.ref_name }}
         allow: security.insecure
         outputs: build
     - name: Upload a Build Artifact

Dockerfile

@@ -1,12 +1,16 @@
 # syntax=docker/dockerfile:1-labs
+ARG GH_BRANCH=main
 FROM rust:latest AS stage-rust
+ARG GH_BRANCH
+ENV GH_BRANCH=${GH_BRANCH}
 # crosscompile stuff
 RUN apt update && apt upgrade -y
 RUN apt install -y gcc-arm-linux-gnueabihf
 RUN rustup target add arm-unknown-linux-gnueabihf
 # cloning and building
 WORKDIR /usr/src/app
-RUN git clone https://github.com/manio/aa-proxy-rs .
+RUN echo "Cloning branch: ${GH_BRANCH}"
+RUN git clone --branch ${GH_BRANCH} --single-branch https://github.com/manio/aa-proxy-rs .
 RUN cargo build --release
 RUN arm-linux-gnueabihf-strip target/arm-unknown-linux-gnueabihf/release/aa-proxy-rs
 # Pi Zero W needs special linking/building (https://github.com/manio/aa-proxy-rs/issues/3)