Adding Earthfile for CI

.github/workflows/ci.yml

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+# .github/workflows/ci.yml
+
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    env:
+      DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
+      DOCKER_TOKEN: ${{ secrets.DOCKER_TOKEN }}
+      FORCE_COLOR: 1
+    steps:
+      - uses: earthly/actions/setup-earthly@v1
+        with:
+          version: v0.7.0
+      - uses: actions/checkout@v2
+      - name: Put back the git branch into git (Earthly uses it for tagging)
+        run: |
+          branch=""
+          if [ -n "$GITHUB_HEAD_REF" ]; then
+            branch="$GITHUB_HEAD_REF"
+          else
+            branch="${GITHUB_REF##*/}"
+          fi
+          git checkout -b "$branch" || true
+      - name: Docker Login
+        run: docker login docker.hibas123.de --username "$DOCKER_USERNAME" --password "$DOCKER_TOKEN"
+      - name: Earthly version
+        run: earthly --version
+      - name: Run build
+        run: earthly --push +docker-multi

Earthfile

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+VERSION 0.7
+FROM rust:alpine
+WORKDIR /rustbuild
+
+prepare-env:
+    RUN apk add --no-cache musl-dev libssl3 openssl-dev
+    RUN cargo search test # Super simple way to cache the cargo index
+
+docker-multi:
+    BUILD --platform linux/amd64 --platform linux/arm64 +docker
+
+build:
+    FROM +prepare-env
+    COPY . .
+    RUN cargo build --release
+    SAVE ARTIFACT target/release/rustocat rustocat
+
+docker:
+    FROM alpine
+    RUN apk add --no-cache libssl3
+    COPY +build/rustocat rustocat
+    ENTRYPOINT ["/bin/sh"]
+    CMD ["-c", "/rustbuild/rustocat"]
+    ARG EARTHLY_TARGET_TAG
+    ARG TAG=$EARTHLY_TARGET_TAG
+    SAVE IMAGE --push docker.hibas123.de/rustocat:latest
+    SAVE IMAGE --push docker.hibas123.de/rustocat:$TAG