github actions ci

.github/workflows/ci.yml

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+# .github/workflows/ci.yml
+
+name: CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    env:
+      FORCE_COLOR: 1
+    steps:
+    - uses: actions/checkout@v3
+    - 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: Download latest earthly
+      run: "sudo /bin/sh -c 'wget https://github.com/earthly/earthly/releases/download/v0.6.30/earthly-linux-amd64 -O /usr/local/bin/earthly && chmod +x /usr/local/bin/earthly'"
+    - name: Earthly version
+      run: earthly --version
+    - name: Run build
+      run: earthly --ci +build