ci: initial workflow

.github/workflows/ci.yml

@@ -0,0 +1,19 @@
+name: CI
+
+on:
+  push:
+    main:
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f # v2.3.4
+
+      - uses: extractions/setup-just@95b912dc5d3ed106a72907f2f9b91e76d60bdb76 # 1.5.0
+
+      - name: Build the Docker image
+        run: |
+          docker image build . \
+            --tag build-configs

Dockerfile

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+FROM php:8.1-cli
+
+WORKDIR /app
+
+ENTRYPOINT ["bash"]