Improve GnuPG key handling

Author: purejava

.github/workflows/build_develop.yml

@@ -18,11 +18,10 @@ jobs:
           cache: 'maven'
       - name: Set up GPG
         run: |
-          echo "$GPG_PRIVATE_KEY" > private.asc
-          gpg --import --batch private.asc
+          echo "$GPG_PRIVATE_KEY" | gpg --batch --import
         env:
           GPG_PRIVATE_KEY: ${{ secrets.GPG_PRIVATE_KEY }}
       - name: Build with Maven
         run: mvn -B -Psign -Dgpg.passphrase=${GPG_PASSPHRASE} -Dtest=org.purejava.integrations.keychain.KeePassXCAccessTest install --file pom.xml
         env:
-          GPG_PASSPHRASE: ${{ secrets.GPG_PASSPHRASE }}
+          GPG_PASSPHRASE: ${{ secrets.GPG_PASSPHRASE }}