I spent hours to find out, why one of my junit tests runs local but not on the github workflow. The test which fails checks the existence of some files to do some configuration stuff. I'm using the maven-resources-plugin to copy these files to a folder inside the target directory. Here is my plugin setting of my pom.xml:
<plugin>
    <!-- move some test resources to target -->
    <artifactId>maven-resources-plugin</artifactId>
    <executions>
        <execution>
            <id>copy-resource-one</id>
            <phase>generate-sources</phase>
            <goals>
                <goal>copy-resources</goal>
            </goals>
            <configuration>
                <outputDirectory>${basedir}/target/test-dir</outputDirectory>
                <resources>
                    <resource>
                        <directory>${basedir}/test-files</directory>
                    </resource>
                </resources>
            </configuration>
        </execution>
    </executions>
</plugin>
The files are copied as expected and mvn clean test runs as expected, but not within a github workflow.
Here is my workflow definition:
name: Sonar Scan
on:
  push:
    branches:
      - develop
      - feature*
      - master
  pull_request:
    types: [opened, synchronize, reopened]
jobs:
  build:
    name: Build
    runs-on: ubuntu-latest
    steps:
      - name: Checkout source
        uses: actions/checkout@v2
      - name: Set up JDK 11
        uses: actions/setup-java@v2.3.1
        with:
          distribution: 'adopt'
          java-version: '11'
      - name: Cache SonarCloud packages
        uses: actions/cache@v1
        with:
          path: ~/.sonar/cache
          key: ${{ runner.os }}-sonar
          restore-keys: ${{ runner.os }}-sonar
      - name: Build and analyze
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}  # Needed to get PR information, if any
          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
        run: mvn -B verify org.sonarsource.scanner.maven:sonar-maven-plugin:sonar -Dsonar.projectKey=abckey
I guess this is a typically RTFM problem, but I didn't find anything.
Any hints?
UPDATE:
Just testet, mvn clean test fails on github workflow too!