Automatically deploy snapshots to central (attempt 3)

Author: jozic

.github/workflows/snapshot.yml

@@ -16,15 +16,14 @@ jobs:
           distribution: 'temurin'
           java-version: '17'
           cache: maven
-          server-id: central
+          server-id: central # Value of the distributionManagement/repository/id field of the pom.xml
           server-username: SONATYPE_USERNAME
           server-password: SONATYPE_PASSWORD
-          gpg-private-key: GPG_PRIVATE_KEY
-          gpg-passphrase: GPG_PASSPHRASE
+          gpg-private-key: ${{ secrets.GPG_PRIVATE_KEY }} # has to be read directly from secrets
+          gpg-passphrase: MAVEN_GPG_PASSPHRASE # default name used by maven-gpg-plugin
       - name: Deploy snapshot
-        run: mvn -ntp clean deploy -P release
+        run: mvn -Dmaven.test.skip=true -ntp -B clean deploy -P release
         env:
           SONATYPE_USERNAME: ${{ secrets.SONATYPE_USERNAME }}
           SONATYPE_PASSWORD: ${{ secrets.SONATYPE_PASSWORD }}
-          GPG_PRIVATE_KEY: ${{ secrets.GPG_PRIVATE_KEY }}
-          GPG_PASSPHRASE: ${{ secrets.GPG_PASSPHRASE }}
+          MAVEN_GPG_PASSPHRASE: ${{ secrets.GPG_PASSPHRASE }}

README.md

@@ -476,8 +476,10 @@ Go to one of them and run `mvn site`.
 
 ## Development
 
-### Manual deployment
+### Snapshot deployment
+A new snapshot is deployed to sonatype on each commit merged to `main` branch. See [snapshot.yml](.github/workflows/snapshot.yml) workflow for details.
 
+### Manual Release deployment
 Set sonatype credentials in `~/.m2/settings.xml`:
 
 ```xml
@@ -492,11 +494,9 @@ Set sonatype credentials in `~/.m2/settings.xml`:
 </settings>
 ```
 
-#### Snapshot deployment
-To deploy snapshot to sonatype snapshot repo run `mvn clean deploy -P release`.
-
-#### Release deployment
-To deploy release to sonatype release repo run `mvn release:clean release:prepare release:perform -P release`.
+To deploy release to sonatype release repo run `mvn release:clean release:prepare release:perform -P release`. 
+Make sure you have proper pgp keys set up.   
+This process will be automated in the future.
 
 ## License
 ```