Added eslint action.

README.md

@@ -1 +1,9 @@
-# actions
+# GitHub actions
+
+Some GitHub actions that I use in my projects.
+
+## Actions
+
+### eslint
+
+JavaScript linter.

eslint/Dockerfile

@@ -0,0 +1,21 @@
+FROM node:8.15.0-alpine@sha256:f30a55706c7336a648493b926128f56176e4500cfdc968764bfdb711716e0109
+
+LABEL name="ESLint"
+LABEL maintainer="Koen Rouwhorst <info@koenrouwhorst.nl>"
+
+LABEL "com.github.actions.name"="GitHub Action for ESLint"
+LABEL "com.github.actions.icon"="code"
+LABEL "com.github.actions.color"="blue"
+
+ENV ESLINT_VERSION=5.11.1 \
+    PATH=/usr/lib/node_modules/.bin:$PATH
+
+RUN npm install -g eslint@${ESLINT_VERSION} && \
+    rm -rf /usr/share/man /tmp/* \
+           /root/.npm /root/.node-gyp \
+           /usr/lib/node_modules/npm/man \
+           /usr/lib/node_modules/npm/doc \
+           /usr/lib/node_modules/npm/html
+
+COPY entrypoint.sh /entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]

eslint/entrypoint.sh

@@ -0,0 +1,3 @@
+#!/usr/bin/env sh
+
+sh -c "eslint $*"