Re enable problem-matcher (#25)

.github/workflows/ShellCheck.yml

@@ -5,8 +5,10 @@ jobs:
     name: ShellCheck
     runs-on: ubuntu-latest
     steps:
+
     - name: Checkout
-      uses: actions/checkout@master
+      uses: actions/checkout@v2
+
     - name: Run ShellCheck
       uses: ./
       with:

Dockerfile

@@ -3,4 +3,6 @@ FROM alpine:3.12.0
 RUN apk add --no-cache shellcheck bash
 
 COPY runaction /action/runaction
+COPY .github/problem-matcher.json /problem-matcher.json
+
 ENTRYPOINT ["bash", "/action/runaction"]

runaction

@@ -1,7 +1,11 @@
 #!/bin/bash
 
 ## Enable problem matcher
+cp /problem-matcher.json ./problem-matcher.json
 
+echo "::add-matcher::problem-matcher.json"
+
+## Run action
 cd "$GITHUB_WORKSPACE" || exit 1
 
 declare statuscode