ci: configure gpg in the GNUPGHOME that setup-java v6 creates

Co-Authored-By: Claude <svc-devxp-claude@slack-corp.com>

Author: zimeg

.github/workflows/release.yml

@@ -23,10 +23,10 @@ jobs:
           java-version: "17"
           distribution: "zulu"
           server-id: central
-          server-username: MAVEN_USERNAME
-          server-password: MAVEN_PASSWORD
+          server-username-env-var: MAVEN_USERNAME
+          server-password-env-var: MAVEN_PASSWORD
           gpg-private-key: ${{ secrets.GPG_KEY }}
-          gpg-passphrase: MAVEN_GPG_PASSPHRASE
+          gpg-passphrase-env-var: MAVEN_GPG_PASSPHRASE
 
       - name: Add snapshot server credentials
         run: |
@@ -39,9 +39,9 @@ jobs:
 
       - name: Configure GPG
         run: |
-          echo "use-agent" >> ~/.gnupg/gpg.conf
-          echo "pinentry-mode loopback" >> ~/.gnupg/gpg.conf
-          echo "allow-loopback-pinentry" >> ~/.gnupg/gpg-agent.conf
+          echo "use-agent" >> "${GNUPGHOME}/gpg.conf"
+          echo "pinentry-mode loopback" >> "${GNUPGHOME}/gpg.conf"
+          echo "allow-loopback-pinentry" >> "${GNUPGHOME}/gpg-agent.conf"
           echo RELOADAGENT | gpg-connect-agent
 
       - name: Publish to Maven Central