servers merge

[awhitford]

The setup-java action provides support for configuring a settings.xml:

    - name: Set up Apache Maven Central
      uses: actions/setup-java@v1
      with: # running setup-java again overwrites the settings.xml
        java-version: 1.8
        server-id: maven # Value of the distributionManagement/repository/id field of the pom.xml
        server-username: MAVEN_USERNAME # env variable for username in deploy
        server-password: MAVEN_CENTRAL_TOKEN # env variable for token in deploy
        gpg-private-key: ${{ secrets.MAVEN_GPG_PRIVATE_KEY }} # Value of the GPG private key to import
        gpg-passphrase: MAVEN_GPG_PASSPHRASE # env variable for GPG private key passphrase

One should be able to use this action to update settings.xml. I believe the two options are skip and override, but ideally there is a merge option too so that one could use this action to add a new server record to an existing settings.xml.

[slawekjaranowski]

use case to testing with change for beginning:

• no existing settings.xml - should create standard setting provided by action
• no existing servers tag in settings.xml
• existing server tag with the same id - should throw exception