Add a Github workflow that allows you to build dev versions of Desktop applications (#309)

* Add a Github workflow that allows you to build dev versions of Desktop applications
* Add pull_request trigger for testing
* Fix errant open quote in Package Khoj App step
* Nix the release step, since this isn't associated with any tags
- Set retention period for uploaded artifacts to 1 day
* Remove pull_request trigger - limit to manual triggers and pushes to master

.github/workflows/build_desktop.yml

@@ -0,0 +1,108 @@
+name: desktop_dev_build
+
+on:
+  push:
+    branches:
+      - master
+  workflow_dispatch:
+
+jobs:
+  publish_desktop_apps:
+    name: 🖥️ Publish Desktop Apps
+
+    strategy:
+      matrix:
+        include:
+        - os: ubuntu-latest
+          extension: deb
+        - os: macos-latest
+          extension: dmg
+        - os: windows-latest
+          extension: exe
+
+    runs-on: ${{ matrix.os }}
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Set up Python 3.9
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.9'
+
+      - name: ⏬️ Install Dependencies
+        shell: bash
+        run: |
+          if [ "$RUNNER_OS" == "Linux" ]; then
+            sudo apt install libegl1 libxcb-xinerama0 python3-tk -y
+          fi
+          python -m pip install --upgrade pip
+          pip install pyinstaller
+
+      - name: ⬇️ Install Khoj App
+        run: |
+          pip install --upgrade .
+
+      - name: 📦 Package Khoj App
+        shell: bash
+        run: |
+          # Setup Environment for Reproducible Builds
+          export PYTHONHASHSEED=42
+          export SOURCE_DATE_EPOCH=$(git log -1 --pretty=%ct)
+
+          pyinstaller --noconfirm Khoj.spec
+          if [ "$RUNNER_OS" == "Windows" ]; then
+            mv dist/Khoj.exe dist/khoj_dev_amd64.exe
+          fi
+
+      - name: 💻 Create Mac App DMG
+        if: matrix.os == 'macos-latest'
+        run: |
+         # Install Mac DMG Creator
+          brew install create-dmg
+          # Copy app to separate dmg folder
+          mkdir -p dist/dmg && cp -r dist/Khoj.app dist/dmg
+          # Create disk image with the app
+          create-dmg \
+            --volname "Khoj" \
+            --volicon "src/khoj/interface/web/assets/icons/favicon.icns" \
+            --window-pos 200 120 \
+            --window-size 600 300 \
+            --icon-size 100 \
+            --icon "Khoj.app" 175 120 \
+            --hide-extension "Khoj.app" \
+            --app-drop-link 425 120 \
+            "dist/khoj_dev_amd64.dmg" \
+            "dist/dmg/"
+
+      - uses: ruby/setup-ruby@v1
+        if: matrix.os == 'ubuntu-latest'
+        with:
+          ruby-version: '3.0'
+
+      - name: 🐧 Create Debian Package
+        if: matrix.os == 'ubuntu-latest'
+        shell: bash
+        run: |
+          # Install Debian Packager
+          gem install fpm
+
+          # Copy app files into expected output directory structure
+          mkdir -p package/opt package/usr/share/applications package/usr/share/icons/hicolor/128x128/apps
+          cp -r dist/Khoj package/opt/Khoj
+          cp src/khoj/interface/web/assets/icons/favicon-128x128.png package/usr/share/icons/hicolor/128x128/apps/Khoj.png
+          cp Khoj.desktop package/usr/share/applications
+
+          # Fix permissions to be usable by non-root users
+          find package/usr/share -type f -exec chmod 644 -- {} +
+          chmod 755 package/opt/Khoj
+
+          # Package the app
+          fpm -C package -s dir -t deb -n Khoj -p dist/khoj_dev_amd64.deb
+
+      - uses: actions/upload-artifact@v3
+        with:
+          name: khoj_dev_amd64.${{matrix.extension}}
+          path: dist/khoj_dev_amd64.${{matrix.extension}}
+          retention-days: 1