Publish snapshot builds

[itsaky]

This PR adds configuration for publishing SNAPSHOT builds to Maven Central.

Version format

The SNAPSHOT builds have the following version name format <release-version>-<commit-hash>-SNAPSHOT where :

• <release-version> - Release version name.
• <commit-hash> - The commit hash of the SNAPSHOT build.

This version name format is only used for CI builds.

Secrets

You need to setup the following repository secrets in order to publish the builds :

Secret	Value	Mapped to environment variable
MVN_USERNAME	Maven central username	ORG_GRADLE_PROJECT_mavenCentralUsername
MVN_PASSWORD	Maven central password	ORG_GRADLE_PROJECT_mavenCentralPassword
MVN_SIGNING_KEY	In-memory signing key	ORG_GRADLE_PROJECT_signingInMemoryKey
MVN_SIGNING_KEY_ID	Signing key ID	ORG_GRADLE_PROJECT_signingInMemoryKeyId
MVN_SIGNING_KEY_PASSWORD	Signing key password	ORG_GRADLE_PROJECT_signingInMemoryKeyPassword

More information can be found here.