ci: make Forgejo JDK install distro-aware

Detect dnf/apt/apk/pacman in the Forgejo release workflow so Java setup works across runner base images.

.forgejo/workflows/build_release.yml

@@ -36,8 +36,19 @@ jobs:
           if command -v java >/dev/null 2>&1; then
             java -version
           else
+            if command -v dnf >/dev/null 2>&1; then
+              dnf install -y java-17-openjdk-devel
+            elif command -v apt-get >/dev/null 2>&1; then
               apt-get update
               apt-get install -y openjdk-17-jdk
+            elif command -v apk >/dev/null 2>&1; then
+              apk add --no-cache openjdk17
+            elif command -v pacman >/dev/null 2>&1; then
+              pacman -Sy --noconfirm jdk17-openjdk
+            else
+              echo "No supported package manager found for JDK installation."
+              exit 1
+            fi
             java -version
           fi