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Dockerfile

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+FROM golang:alpine3.11
+
+LABEL name="prometheus-operator-lint-action"
+LABEL repository="http://github.com/p1nkun1c0rns/prometheus-operator-lint-action"
+LABEL homepage="http://github.com/p1nkun1c0rns/prometheus-operator-lint-action"
+LABEL maintainer="Richard Steinbrueck <[email protected]>"
+
+ENV GO111MODULE on
+ENV PO_LINT_VERSION 0.38.0
+
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
+# hadolint ignore=DL3018
+RUN apk add --no-cache \
+        git
+
+RUN go get -u github.com/coreos/prometheus-operator/cmd/po-lint@v${PO_LINT_VERSION}
+
+ENTRYPOINT [ "/entrypoint.sh" ]

action.yml

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+name: 'Prometheus Operator Lint Action'
+author: 'Richard Steinbrueck'
+description: 'Run po-lint on your yaml files'
+inputs:
+  path:
+    description: 'Path to scan for files within the directory (and nested directories)'
+    required: false
+    default: './'
+  file_extension:
+    description: ''
+    required: false
+    default: '*.yaml'
+  exclude:
+    description: 'should be a substring of the folder path you want to exclude'
+    required: false
+    default: ''
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+  args:
+    - ${{ inputs.path }}
+    - ${{ inputs.file_extension }}
+    - ${{ inputs.exclude }}
+branding:
+  icon: 'terminal'
+  color: 'red'

entrypoint.sh

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+#!/bin/sh
+
+INPUT_PATH=$1
+INPUT_FILES=$2
+INPUT_EXCLUDE=$3
+
+echo "Linting '${INPUT_FILES}' files in directory '${INPUT_PATH}'..."
+had_errors=0
+for file in $(find ${INPUT_PATH} -name ${INPUT_FILES}); do
+  # Exclude Grafana dashboards
+  if echo "${file}" | grep -q ${INPUT_EXCLUDE}
+  then
+      echo "skip -> ${file}"
+      continue
+  fi
+
+  po-lint "${file}"
+  retval=$?
+  if [ $retval -ne 0 ]; then
+    had_errors=1
+  fi
+done
+exit ${had_errors}