ci: try building multi-arch docker image

.dockerignore

@@ -1,4 +1,5 @@
 _build
+db
 deps
-.git
-.elixir_ls
+maps
+priv

.github/workflows/build.yml

@@ -0,0 +1,31 @@
+name: Build
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    concurrency: build
+    steps:
+      - uses: actions/checkout@v4
+      - uses: docker/setup-qemu-action@v3
+      - uses: docker/setup-buildx-action@v3
+      - run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u $ --password-stdin
+      - uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: ghcr.io/pikdum/thistle_tea:latest
+          platforms: linux/amd64,linux/arm64
+      - uses: snok/container-retention-policy@v2
+        with:
+          image-names: pikdum/thistle_tea
+          cut-off: 1 day ago utc
+          keep-at-least: 1
+          account-type: personal
+          token: ${{ secrets.GITHUB_TOKEN }}
+          token-type: github-token

Dockerfile

@@ -1,5 +1,7 @@
-FROM elixir:1.17-alpine AS build
-ENV MIX_ENV prod
+FROM elixir:1.17 AS build
+ENV MIX_ENV=prod
+COPY --from=rust:latest /usr/local/cargo/bin/* /usr/local/bin/
+RUN rustup default stable
 WORKDIR /app
 RUN mix local.hex --force && mix local.rebar --force
 COPY mix.exs mix.lock ./
@@ -8,11 +10,9 @@ COPY . .
 RUN mix compile
 RUN mix release
 
-FROM elixir:1.17-alpine
+FROM elixir:1.17
 WORKDIR /app
 COPY --from=build /app/_build/prod/rel/thistle_tea ./
-COPY --from=build /app/mangos0.sqlite ./
-COPY --from=build /app/dbc.sqlite ./
 EXPOSE 3724
 EXPOSE 8085
 CMD ["/app/bin/thistle_tea", "start"]