WIP: Add AppImage workflow

.github/workflows/appimage.yml

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+name: Build AppImage
+
+on:
+  workflow_dispatch:
+  push:
+
+
+jobs:
+  build:
+    runs-on: ubuntu-20.04
+
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: true
+          fetch-depth: 1
+
+      - name: Install debian dependencies
+        run: |
+          sudo apt-get install -y \
+            python3.9             \
+            python3.9-venv        \
+            npm                   \
+            curl                  \
+            jq
+
+      - name: Download latest pkg2appimage release
+        run: |
+          set -x
+          cd appimage_dist
+          URL="$(curl -s https://api.github.com/repos/AppImage/pkg2appimage/releases/latest | jq -r '.assets | map(select( .name | test("^pkg2appimage-.*-x86_64.AppImage$")))[0] .browser_download_url')"
+          curl --location --output pkg2appimage "$URL"
+          chmod u+x pkg2appimage
+
+      - name: Build AppImage
+        run: |
+          set -x
+          export ARCHIVEBOXSRCDIR="$(pwd)"
+          cd appimage_dist
+          ARCH=x86_64 ./pkg2appimage archivebox.yml
+
+      - name: Archive build Appimage
+        uses: actions/upload-artifact@v2
+        with:
+          name: AppImage
+          path: appimage_dist/out
+
+      #- name: Add some links to test
+        #run: |
+          #mkdir data && cd data
+          #archivebox init
+          #archivebox add 'https://example.com'
+          #archivebox version
+          #archivebox status
+
+      # - name: Push build to PyPI
+      #   run: |
+      #     cd pip_dist/
+      #     python3 -m twine upload --repository testpypi pip_dist/*.{whl,tar.gz}
+      #     python3 -m twine upload --repository pypi pip_dist/*.{whl,tar.gz}
+
+      # - name: Commit built package
+      #   run: |
+      #     cd pip_dist/
+      #     git config --local user.email "action@github.com"
+      #     git config --local user.name "GitHub Action"
+      #     git commit -m "Pip package autobuild" -a
+
+      # - name: Push build to Github
+      #   uses: ad-m/github-push-action@master
+      #   with:
+      #     github_token: ${{ secrets.GITHUB_TOKEN }}
+      #     repository: ArchiveBox/pip-archivebox
+      #     branch: ${{ github.ref }}
+      #     directory: pip_dist
+

appimage_dist/archivebox.yml

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+# Note: due to reasons, this requires a python3 (matching, e.g. python3.9 on both), python3-venv, nodejs and npm ON THE BUILDING HOST
+app: archivebox
+ingredients:
+  dist: focal
+  sources:
+    # Order is important, currently (as of 2022-01-23) apt-get.do-download in pkg2appimage prefers earlier sources
+    # When switching distributions, be sure to adapt the pythonpath in `script:` as well
+    - deb https://deb.nodesource.com/node_14.x focal main
+    - deb http://archive.ubuntu.com/ubuntu/ focal focal-updates focal-security main universe
+    - deb http://archive.ubuntu.com/ubuntu/ focal-updates main universe
+    - deb http://archive.ubuntu.com/ubuntu/ focal-security main universe
+  packages:
+    - python3.9-venv
+    - nodejs
+    - npm
+    - wget
+    - curl
+script:
+  - wget -c "https://raw.githubusercontent.com/ArchiveBox/ArchiveBox/dev/icon.png" -O archivebox.png
+  - cp ./archivebox.png ./usr/share/icons/hicolor/256x256/
+  - npm install -g --prefix ./usr 'git+https://github.com/pirate/readability-extractor'
+  - npm install -g --prefix ./usr '@postlight/mercury-parser'
+  - npm install -g --prefix ./usr 'gildas-lormeau/SingleFile#master'
+  - python3.9 -m venv usr
+  - source ./usr/bin/activate
+  - ./usr/bin/pip3 install --ignore-installed "$ARCHIVEBOXSRCDIR"
+  - cat > archivebox.desktop <<\EOF
+  - [Desktop Entry]
+  - Type=Application
+  - Terminal=true
+  - Name=archivebox
+  - Exec=archivebox
+  - Categories=Network;
+  - Icon=archivebox
+  - EOF
+  - usr/bin/pip3 freeze | grep "archivebox" | cut -d "=" -f 3 | head -n1 > ../VERSION
+  # Fixup the pythonpath: Warning: the import os happens some lines below
+  - sed -i '3s|^|import sys\nsys.path.insert(0, os.getenv("APPDIR") + "/usr/lib/python3.9/site-packages")\nsys.path.insert(0, os.getenv("APPDIR") + "/usr/lib/python3.9")\n|' ./usr/bin/archivebox
+  # Prepare it for "recursion", i.e. calling other python programms
+  - sed -i '3s|^|os.environ["PYTHONPATH"] = os.getenv("APPDIR") + "/usr/lib/python3.9:" + os.getenv("APPDIR") + "/usr/lib/python3.9/site-packages"\n|' ./usr/bin/archivebox
+  # Appimage chdirs to usr/ by default...
+  - sed -i '3s|^|import os\nos.chdir(os.getenv("OWD"))\n|' ./usr/bin/archivebox
+  # Patch python interpreter path
+  - find . -type f -exec sed -i '1 s|^#!/.*\.AppDir/usr/bin/\(python3*\)|#!/usr/bin/env \1|g' {} +