Fix workflow

Author: HyperWinX

.github/workflows/mainline-test.yml

@@ -36,16 +36,18 @@ jobs:
         shell: bash
         run: |
           if [[ "${{ matrix.image }}" == "debian:stable" ]]; then
-            apt update && apt install unzip -y
+            apt update && apt install unzip file -y
           elif [[ "${{ matrix.image }}" == "fedora:latest" ]]; then
             dnf update -y && dnf install unzip -y
           else
             pacman -Sy --noconfirm && pacman -S unzip --noconfirm
           fi
           ls -la artifacts
+          file artifacts/*.tar.gz
           for archive in artifacts/*.tar.gz; do
-            tar -xpf "$archive" -C / --overwrite
+            tar -xpf "$subarchive" -C / --overwrite
             for f in /opt/hcpu/tests/*; do
               [ -f "$f" ] && [ -x "$f" ] && "$f"
             done
+            rm -rf unpacked
           done