feat: add precheck if any test exists

.github/workflows/redirect_tests.yml

@@ -3,7 +3,7 @@ on:
   workflow_dispatch:
     inputs:
       search_path:
-        description: "Subpath to test, e.g. '/osw' ('/*' = all subpaths)" 
+        description: "Subpath(s) to test, e.g. '/osw;/emmo;/pmd' ('/*' = all subpaths)" 
         default: '/*'
   pull_request:
 
@@ -17,13 +17,21 @@ jobs:
           with:
             fetch-depth: 0
 
+        - name: Check if at least one test exists
+          id: precheck
+          continue-on-error: true # if 'false' the whole workflow will fail if no test was defined
+          run: find $(IFS=';' read -ra paths <<< "${{ github.event.inputs.search_path }}"; for path in "${paths[@]}"; do echo ".$path "; done) -type f -name ".htaccess" -print0 | xargs -0 grep "##TEST"
+
         - name: Run apache docker
-          run: docker run -dit --name apache -e SEARCH_PATH=${{ github.event.inputs.search_path }} -v "$PWD":/usr/local/apache2/htdocs/ -v "$PWD"/.test/conf/httpd.conf:/usr/local/apache2/conf/httpd.conf httpd:2.4
+          if: steps.precheck.outcome == 'success'
+          run: docker run -dit --name apache -e SEARCH_PATH="${{ github.event.inputs.search_path }}" -v "$PWD":/usr/local/apache2/htdocs/ -v "$PWD"/.test/conf/httpd.conf:/usr/local/apache2/conf/httpd.conf httpd:2.4
 
         - name: Install curl
+          if: steps.precheck.outcome == 'success'
           run: docker exec -i apache sh -c "apt-get update && apt-get install curl"
 
         - name: Run tests
+          if: steps.precheck.outcome == 'success'
           run: docker exec -i apache bash < .test/test.sh
 
   pull_request_test:
@@ -52,12 +60,20 @@ jobs:
             done
             echo "SEARCH_PATH=$paths" >> $GITHUB_ENV
             echo "set SEARCH_PATH to $SEARCH_PATH"
+            
+        - name: Check if at least one test exists
+          id: precheck
+          continue-on-error: true # if 'false' the whole workflow will fail if no test was defined
+          run: find $(IFS=';' read -ra paths <<< "$SEARCH_PATH"; for path in "${paths[@]}"; do echo ".$path "; done) -type f -name ".htaccess" -print0 | xargs -0 grep "##TEST"
 
         - name: Run apache docker
+          if: steps.precheck.outcome == 'success'
           run: docker run -dit --name apache -e SEARCH_PATH="$SEARCH_PATH" -v "$PWD":/usr/local/apache2/htdocs/ -v "$PWD"/.test/conf/httpd.conf:/usr/local/apache2/conf/httpd.conf httpd:2.4
 
         - name: Install curl
+          if: steps.precheck.outcome == 'success'
           run: docker exec -i apache sh -c "apt-get update && apt-get install curl"
 
         - name: Run tests
+          if: steps.precheck.outcome == 'success'
           run: docker exec -i apache bash < .test/test.sh