Releasing requires some changes

[Capstan]

The update to Gradle 5.6.1 removed the --recompile-scripts flag (gradle/gradle#1425), so doRelease.sh needs to remove it. Not sure what, if anything, it should be replaced with.

GPG 2.1 does not produce a secring.gpg by default, or use the short key ids. https://stackoverflow.com/a/39573795 has some suggestions:

• gpg --export-secret-keys -o ~/.gnupg/secring.gpg will export it in the old format (chmod it to be narrowly readable). It appears to work, though I wonder if it could be adapted to use the existing key in ~/.gnupg/private-keys-v1.d/.
• gpg --list-keys --keyid-format short will show the key id in the format that it will be understandable.

At the moment, I don't have permissions on Sonatype, getting errors of the form:

Could not transfer artifact com.github.java-json-tools:jackson-coreutils:jar:1.10 from/to remote (https://oss.sonatype.org/service/local/staging/deploy/maven2/): Access denied to: https://oss.sonatype.org/service/local/staging/deploy/maven2/com/github/java-json-tools/jackson-coreutils/1.10/jackson-coreutils-1.10.jar, ReasonPhrase: Forbidden.

[Capstan]

/cc @huggsboson

[Capstan]

Exporting keys after umask 0077 should make the chmod unnecessary.

[Capstan]

Filed OSSRH-51294 to get the docs improved.