Revert "Use GPG_PRIVATE_KEY directly in build"

This reverts commit eed2ff1.

Author: eleftherias

.github/workflows/continuous-integration-workflow-2.4.x.yml

@@ -60,11 +60,14 @@ jobs:
           export GRADLE_ENTERPRISE_CACHE_USERNAME="$GRADLE_ENTERPRISE_CACHE_USER"
           export GRADLE_ENTERPRISE_CACHE_PASSWORD="$GRADLE_ENTERPRISE_CACHE_PASSWORD"
           export GRADLE_ENTERPRISE_ACCESS_KEY="$GRADLE_ENTERPRISE_SECRET_ACCESS_KEY"
+          export VERSION_HEADER=$'Version: GnuPG v2\n\n'
+          export ORG_GRADLE_PROJECT_signingKey=${GPG_PRIVATE_KEY#"$VERSION_HEADER"}
+          export ORG_GRADLE_PROJECT_signingPassword="$GPG_PASSPHRASE"
           ./gradlew deployArtifacts -PossrhUsername="$OSSRH_TOKEN_USERNAME" -PossrhPassword="$OSSRH_TOKEN_PASSWORD" -PartifactoryUsername="$ARTIFACTORY_USERNAME" -PartifactoryPassword="$ARTIFACTORY_PASSWORD" --stacktrace --no-parallel
           ./gradlew finalizeDeployArtifacts -PossrhUsername="$OSSRH_TOKEN_USERNAME" -PossrhPassword="$OSSRH_TOKEN_PASSWORD" -PartifactoryUsername="$ARTIFACTORY_USERNAME" -PartifactoryPassword="$ARTIFACTORY_PASSWORD" --stacktrace --no-parallel
         env:
-          ORG_GRADLE_PROJECT_signingKey: ${{ secrets.GPG_PRIVATE_KEY }}
-          ORG_GRADLE_PROJECT_signingPassword: ${{ secrets.GPG_PASSPHRASE }}
+          GPG_PRIVATE_KEY: ${{ secrets.GPG_PRIVATE_KEY }}
+          GPG_PASSPHRASE: ${{ secrets.GPG_PASSPHRASE }}
           OSSRH_TOKEN_USERNAME: ${{ secrets.OSSRH_TOKEN_USERNAME }}
           OSSRH_TOKEN_PASSWORD: ${{ secrets.OSSRH_TOKEN_PASSWORD }}
           ARTIFACTORY_USERNAME: ${{ secrets.ARTIFACTORY_USERNAME }}