Changes due to new handling of system environment

Introduced with PR #2957

.github/workflows/appimage.yml

@@ -67,6 +67,7 @@ jobs:
           REVISION_NUM: ${{  needs.get-version.outputs.revNum }}
       - name: Run jpackage
         run: >
+          TRAYICONSDIR="@{appdir}/usr/share/icons/hicolor/symbolic/apps"
           ${JAVA_HOME}/bin/jpackage
           --verbose
           --type app-image
@@ -92,7 +93,7 @@ jobs:
           --java-options "-Dcryptomator.ipcSocketPath=\"~/.config/Cryptomator/ipc.socket\""
           --java-options "-Dcryptomator.mountPointsDir=\"~/.local/share/Cryptomator/mnt\""
           --java-options "-Dcryptomator.showTrayIcon=false"
-          --java-options "-Dcryptomator.integrationsLinux.trayIconsDir=\"/usr/share/icons/hicolor/symbolic/apps\""
+          --java-options "-Dcryptomator.integrationsLinux.trayIconsDir=\"${TRAYICONSDIR}\"" \
           --java-options "-Dcryptomator.buildNumber=\"appimage-${{  needs.get-version.outputs.revNum }}\""
           --add-launcher Cryptomator-gtk2=launcher-gtk2.properties
           --resource-dir dist/linux/resources