repackage .deb installs to use older gzip instead of zstd compression

.github/workflows/package.yaml

@@ -30,6 +30,9 @@ jobs:
       - name: Package tar distribution
         if: ${{ runner.os == 'Linux' }}
         run: ./gradlew packageTarDistribution
+      - name: Repackage deb distribution
+        if: ${{ runner.os == 'Linux' }}
+        run: ./repackage.sh
       - name: Upload Artifact
         uses: actions/upload-artifact@v4
         with:
@@ -43,6 +46,9 @@ jobs:
       - name: Package headless tar distribution
         if: ${{ runner.os == 'Linux' }}
         run: ./gradlew -Djava.awt.headless=true packageTarDistribution
+      - name: Repackage headless deb distribution
+        if: ${{ runner.os == 'Linux' }}
+        run: ./repackage.sh
       - name: Upload Headless Artifact
         if: ${{ runner.os == 'Linux' }}
         uses: actions/upload-artifact@v4

repackage.sh

@@ -0,0 +1,48 @@
+#!/bin/bash
+set -e  # Exit on any error
+
+# Define paths
+BUILD_DIR="build"
+JPACKAGE_DIR="$BUILD_DIR/jpackage"
+TEMP_DIR="$BUILD_DIR/repackage"
+
+# Find the .deb file in build/jpackage (assuming there is only one)
+DEB_FILE=$(find "$JPACKAGE_DIR" -type f -name "*.deb" -print -quit)
+
+# Check if a .deb file was found
+if [ -z "$DEB_FILE" ]; then
+  echo "Error: No .deb file found in $JPACKAGE_DIR"
+  exit 1
+fi
+
+# Extract the filename from the path for later use
+DEB_FILENAME=$(basename "$DEB_FILE")
+
+echo "Found .deb file: $DEB_FILENAME"
+
+# Create a temp directory inside build to avoid file conflicts
+mkdir -p "$TEMP_DIR"
+cd "$TEMP_DIR"
+
+# Extract the .deb file contents
+ar x "../../$DEB_FILE"
+
+# Decompress zst files to tar
+unzstd control.tar.zst
+unzstd data.tar.zst
+
+# Compress tar files to xz
+xz -c control.tar > control.tar.xz
+xz -c data.tar > data.tar.xz
+
+# Remove the original .deb file
+rm "../../$DEB_FILE"
+
+# Create the new .deb file with xz compression in the original location
+ar cr "../../$DEB_FILE" debian-binary control.tar.xz data.tar.xz
+
+# Clean up temp files
+cd ../..
+rm -rf "$TEMP_DIR"
+
+echo "Repackaging complete: $DEB_FILENAME"