ci(actions): use hadolint (#121)

.github/workflows/dockerimage.yml

@@ -1,6 +1,6 @@
 name: Test Docker image
 
-on: [push]
+on: [push, pull_request]
 
 jobs:
   build:

.github/workflows/hadolint.yml

@@ -0,0 +1,11 @@
+name: Lint Dockerfiles
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v2
+      - run: brew install hadolint
+      - run: hadolint {10,12}/Dockerfile

.travis.yml

@@ -1,11 +0,0 @@
-language: generic
-
-services:
-  - docker
-
-before_install:
-  - docker pull hadolint/hadolint
-
-script:
-  - docker run --rm -i hadolint/hadolint hadolint --ignore DL3018 - < 10/Dockerfile
-  - docker run --rm -i hadolint/hadolint hadolint --ignore DL3018 - < 12/Dockerfile

README.md

@@ -2,7 +2,8 @@
 
 [![Docker Automated build](https://img.shields.io/docker/automated/timbru31/node-alpine-git.svg)](https://hub.docker.com/r/timbru31/node-alpine-git/)
 [![buildx Status](https://github.com/timbru31/docker-node-alpine-git/workflows/buildx/badge.svg)](https://github.com/timbru31/docker-node-alpine-git/actions?query=workflow%3Abuildx)
-[![Build Status](https://travis-ci.org/timbru31/docker-node-alpine-git.svg?branch=master)](https://travis-ci.org/timbru31/docker-node-alpine-git)
+[![Lint Dockerfiles](https://github.com/timbru31/docker-node-alpine-git/workflows/Lint%20Dockerfiles/badge.svg)](https://github.com/timbru31/docker-node-alpine-git/actions?query=workflow%3A%22Lint+Dockerfiles%22)
+
 
 A minimal Dockerfile based on Node.js 10 LTS (Dubnium) or Node.js 12 LTS (Erbium) alpine with Git and ssh installed.