Try that

.forgejo/workflows/build.yml

@@ -5,7 +5,7 @@ jobs:
     container: debian:sid
     steps:
       - name: Prepare for installation
-        run: apt update
+        run: echo ${GITHUB_HEAD_REF:-${GITHUB_REF#refs/heads/}} && apt update
       - name: Install JDK and other deps
         run: apt install --no-install-recommends -y openjdk-21-jdk-headless maven git nodejs curl zstd
 
@@ -16,7 +16,7 @@ jobs:
      #   run: mkdir /tmp/buildtools && cd /tmp/buildtools && curl -O https://hub.spigotmc.org/jenkins/job/BuildTools/lastSuccessfulBuild/artifact/target/BuildTools.jar && java -jar BuildTools.jar --rev 1.21.1 --remapped && cd
 
       - name: Download NMS
-        run: echo ${GITHUB_HEAD_REF:-${GITHUB_REF#refs/heads/} && pwd && ls && ./tools/download_nms.sh ~
+        run: pwd && ls && ./tools/download_nms.sh ~
 
       - name: Build for 1.21.1
         run: mvn clean package