Revert AppImage back to using 3.8

.github/workflows/ci.yml

@@ -157,10 +157,10 @@ jobs:
           echo "sha_short=$(git rev-parse --short HEAD)" >> "${GITHUB_OUTPUT}"
 
       # Ensure Python version
-      - name: Set up Python
-        uses: actions/setup-python@v4
-        with:
-          python-version: ${{env.PYTHON_VERSION}}
+      # - name: Set up Python
+      #   uses: actions/setup-python@v4
+      #   with:
+      #     python-version: ${{env.PYTHON_VERSION}}
 
       - name: Append git revision to project version
         run: |

appimage/AppImageBuilder.yml

@@ -23,7 +23,7 @@ script:
   - cp "$SOURCE_DIR/pickaxe.png" "$TARGET_APPDIR/usr/share/icons/hicolor/128x128/apps/io.github.devilxd.twitchdropsminer.png"
 
   # Install requirements.
-  - python{{PYTHON_VERSION}} -m pip install --ignore-installed --prefix=/usr --root="$TARGET_APPDIR" -r "$SOURCE_DIR/../requirements.txt"
+  - python3 -m pip install --ignore-installed --prefix=/usr --root="$TARGET_APPDIR" -r "$SOURCE_DIR/../requirements.txt"
 
 AppDir:
   app_info:
@@ -31,7 +31,7 @@ AppDir:
     name: Twitch Drops Miner
     icon: io.github.devilxd.twitchdropsminer
     version: '{{APP_VERSION}}'
-    exec: usr/bin/python{{PYTHON_VERSION}}
+    exec: usr/bin/python3
     exec_args: '${APPDIR}/usr/src/main.py $@'
 
   apt:
@@ -126,7 +126,7 @@ AppDir:
     env:
       PATH: '${APPDIR}/usr/bin:${PATH}'
       PYTHONHOME: '${APPDIR}/usr'
-      PYTHONPATH: '${APPDIR}/usr/lib/python{{PYTHON_VERSION}}/tkinter:${APPDIR}/usr/lib/python{{PYTHON_VERSION}}/site-packages'
+      PYTHONPATH: '${APPDIR}/usr/lib/python3.8/tkinter:${APPDIR}/usr/lib/python3.8/site-packages'
       APPDIR_LIBRARY_PATH: '${APPDIR}/usr/lib:${APPDIR}/usr/lib/x86_64-linux-gnu:${APPDIR}/lib/x86_64-linux-gnu'
       TCL_LIBRARY: '${APPDIR}/usr/share/tcltk/tcl8.6'
       TK_LIBRARY: '${APPDIR}/usr/lib/tcltk/x86_64-linux-gnu/tk8.6'