Update maintainer docs (#49)

Summary:
Document the new semi-automated workflow.

Pull Request resolved: facebookincubator/fbjni#49

Test Plan: _eyes

Reviewed By: nikoant

Differential Revision: D26607139

Pulled By: passy

fbshipit-source-id: 1f335b6b254bd5053c8f63ab872f55254207295a

Author: passy

first-party/fbjni/docs/maintainers.md

@@ -1,11 +1,21 @@
-## Release Procedure
+## Release Procedure (Semi-Automated)
 
-In your `~/.gradle/gradle.properties`, set `bintrayUsername` and `bintrayApiKey` values
-you can find in your [Bintray profile](https://bintray.com/profile/edit).
+1. Bump the `VERSION_NAME` in `gradle.properties`.
+2. `hg commit -m 'vx.y.z'`, submit, land.
+3. Create a new release on the [Github release page](https://github.com/facebookincubator/fbjni/releases). This triggers a [release action](https://github.com/facebookincubator/fbjni/actions/workflows/release.yml).
+4. Bump the `VERSION_NAME` to the next patch release and appending `-SNAPSHOT`, commit, land.
+
+## Release Procedure (Manual)
+
+In your `~/.gradle/gradle.properties`, set:
+    - `SONATYPE_NEXUS_USERNAME`, `SONATYPE_NEXUS_PASSWORD` (you can find these on https://oss.sonatype.org/#profile;User%20Token)
+    - `signing.secretKeyRingFile` (to your secring.gpg)
+    - `signing.keyId` (Check `gpg --list-secret-keys`)
+    - `signing.password`
 
 1. Bump the `VERSION_NAME` in `gradle.properties`.
 2. `hg commit -m 'vx.y.z'`, submit, land.
-3. From the checked out GitHub repository, run `./gradlew bintrayUpload` (Android uploads).
-4. From the checked out GitHub repository, run `./gradlew -b host.gradle bintrayUpload` (Java-only uploads).
+3. From the checked out GitHub repository, run `./gradlew assembleRelease uploadArtifacts` (Android uploads).
+4. From the checked out GitHub repository, run `./gradlew -b host.gradle assemble uploadArtifacts` (Java-only uploads).
 5. Bump the `VERSION_NAME` to the next patch release and appending `-SNAPSHOT`, commit, land.
 6. Tag the release on the [Github release page](https://github.com/facebookincubator/fbjni/releases).