Use the Dockerfile from this repo to lint the Dockerfile.

Instead of using the latest image of docker-pre-commit in Docker Hub,
build the image locally and use that to lint the Dockerfile. Added a
wrapper script for that.

.pre-commit-config.yaml

@@ -29,14 +29,15 @@ repos:
       - id: hadolint
         name: Hadolint Dockerfile linter
         description: Dockerfile linter, validate inline bash, written in Haskell
-        minimum_pre_commit_version: '0.18.0'
-        language: docker_image
-        entry: adarnimrod/docker-pre-commit hadolint
         types: [dockerfile]
+        language: script
+        entry: pre-commit-docker-wrapper
+        args: [hadolint]
       - id: dockerfile-lint
         name: dockerfile-lint
         description: A rule based 'linter' for Dockerfiles
         minimum_pre_commit_version: '0.18.0'
-        language: docker_image
-        entry: adarnimrod/docker-pre-commit dockerfile-lint
         types: [dockerfile]
+        language: script
+        entry: pre-commit-docker-wrapper
+        args: [hadolint]

pre-commit-docker-wrapper

+#!/bin/sh
+set -eux
+
+docker build -t docker-pre-commit .
+docker run -v "$PWD:/repo:ro" -w /repo --user "$(id -u):$(id -g)" --rm docker-pre-commit "$@"