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.github/workflows/dockerfile-linter.yml

@@ -0,0 +1,22 @@
+---
+name: Lint Dockerfiles
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches: [ master ]
+    paths:
+      - 'Dockerfile*'
+
+jobs:
+  lint-dockerfiles:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Lint the Dockerfiles
+        run: |
+          make lint-all

.hadolint.yml

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+# # Hadolint config file
+# # https://hadolint.github.io/hadolint/
+
+# Failure mode
+failure-threshold: none
+no-fail: false
+
+# Output format
+format: tty
+no-color: true

Makefile

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+# # Makefile
+.DEFAULT_GOAL := all
+SHELL := /usr/bin/env sh
+
+
+# # # Help
+
+.PHONY: help
+help:
+	@echo "Usage: make [TARGET:-all]"
+	@echo "TARGET:"
+	@echo "  all"
+	@echo "  lint-dockerfile FILE"
+	@echo "  lint-all"
+
+
+# # # Default goal
+
+.PHONY: all
+all: lint-all
+	$(info Done running 'make all')
+
+
+# # # Lint the Dockerfile
+
+.PHONY: lint-dockerfile
+lint-dockerfile:
+ifeq ($(origin FILE), undefined)
+	@# Usage: make lint-dockerfile FILE=./Dockerfile
+	$(error variable FILE is not set)
+else
+	docker run \
+		--rm \
+		--interactive \
+		--network=none \
+		--volume="$(CURDIR)/.hadolint.yml:/.hadolint.yml:ro" \
+		hadolint/hadolint < $(FILE)
+endif
+
+
+.PHONY: lint-all lint-all-%
+lint-all: $(foreach FILE, $(wildcard $(CURDIR)/Dockerfile*), lint-all-$(notdir $(FILE)))
+lint-all-%:
+	$(MAKE) lint-dockerfile FILE=$(CURDIR)/$*