Support deploying JARs and POMs to Maven compatible repositories

[aalmiray]

Sonatype Nexus2 powers Maven Central for the time being. Publishing artifacts to Maven Central has been requested since the early days.

JReleaser may need a new wrokflow step: deploy.
JARs & POMs should be "staged" using the build tool of choice that is, files should be placed at a local directory using the default layout expected by Nexus. For example

target/
└── staging-deploy
    └── test
        └── jreleaser
            └── app
                ├── 1.0.0
                │   ├── app-1.0.0.pom
                │   ├── app-1.0.0.pom.asc
                │   ├── app-1.0.0.pom.asc.md5
                │   ├── app-1.0.0.pom.asc.sha1
                │   ├── app-1.0.0.pom.md5
                │   └── app-1.0.0.pom.sha1
                ├── maven-metadata.xml
                ├── maven-metadata.xml.md5
                └── maven-metadata.xml.sha1

Additionally, JReleaser may perform the following tasks before deploying takes place:

• pom files comply with the minimum set of elements (via pomchecker)
• -sources & -javadoc JARs are available
• generate sha256 and sha512 checksums
• sign all artifacts when PGP is configured. Avoids configuring PGP on the build tool

[hboutemy]

notice that .asc.md5 and .asc.sha1 and other checksums for .asc are not useful (even if they are not forbidden): https://central.sonatype.org/publish/requirements/#sign-files-with-gpgpgp

[aalmiray]

What do you mean with "not useful"? AFAICT there's a checksum rule that triggers when there are no matching checksum files.

[hboutemy]

no, not for .asc because they are not an attached artifact
see for example https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-artifact-plugin/3.3.0/ and you'll see that .asc is there, but no checksums for it

[aalmiray]

Oh, oh, So it's the gradle plugin I'm using that calculates checksums for signature files ... well what a surprise there 😏

Thus, I only have to calculate checksums for JARs & POMs, but not for signatures, right?

[aalmiray]

Also support:

• JFrog Artifactory
• Gitea Packages
• Gitlab Packages
• Github packages

[aalmiray]

Released in v1.3.0 -> https://github.com/jreleaser/jreleaser/releases/tag/v1.3.0