github-settings.xml

<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
                      http://maven.apache.org/xsd/settings-1.0.0.xsd">
  <activeProfiles>
    <activeProfile>github</activeProfile>
    <activeProfile>release</activeProfile>
  </activeProfiles>

  <profiles>
    <profile>
      <id>github</id>
      <repositories>
        <repository>
          <id>central</id>
          <url>https://repo1.maven.org/maven2</url>
        </repository>
        <repository>
          <id>github</id>
          <url>https://maven.pkg.github.com/OWNER/*</url>
          <snapshots>
            <enabled>true</enabled>
          </snapshots>
        </repository>
      </repositories>
      <properties>
        <gpg.executable>gpg</gpg.executable>
        <gpg.keyname>${env.GPG_KEY_NAME}</gpg.keyname>
        <gpg.passphrase>${env.GPG_PASSPHRASE}</gpg.passphrase>
      </properties>
    </profile>
  </profiles>

  <servers>
    <server>
      <id>github</id>
      <username>${env.GITHUB_USER}</username>
      <password>${env.GITHUB_PASSWORD}</password>
    </server>
  </servers>

</settings>