Publish builds to a branch instead of to releases.

Releases and version numbers are gone. CI now rebuilds all three platforms
on every change to main and commits the packages to the `builds` branch,
so what anyone downloads is the current state of the repository. The
branch is rewritten from scratch each time rather than added to, so the
repository keeps one copy of the packages instead of a ~70 MB set per
commit.

Without tags there is no version to compare, so a build carries the
commit it was made from and the branch carries a VERSION file naming the
same commit. The updater fetches those few bytes and treats any
difference as being behind; commits are not ordered, and the branch only
ever holds the current build.

The installers fetch from the branch over raw.githubusercontent.com for
the same reason.

Co-authored-by: Cursor <cursoragent@cursor.com>

.github/workflows/release.yml

@@ -1,141 +0,0 @@
-name: Release
-
-on:
-  push:
-    tags:
-      - "v*"
-
-permissions:
-  contents: write
-
-jobs:
-  linux:
-    name: Linux AppImage
-    runs-on: ubuntu-22.04
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Install dependencies
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y \
-            build-essential pkg-config curl \
-            libgtk-4-dev librsvg2-dev \
-            desktop-file-utils \
-            appstream
-
-      - name: Build AppImage
-        env:
-          VERSION: ${{ github.ref_name }}
-        run: |
-          chmod +x scripts/bundle-linux.sh
-          ./scripts/bundle-linux.sh
-
-      - name: Upload artifact
-        uses: actions/upload-artifact@v4
-        with:
-          name: maturita-linux
-          path: dist/maturita-linux-*.AppImage
-
-  windows:
-    name: Windows zip
-    runs-on: windows-latest
-    defaults:
-      run:
-        shell: msys2 {0}
-    steps:
-      - uses: actions/checkout@v4
-
-      - uses: msys2/setup-msys2@v2
-        with:
-          msystem: UCRT64
-          update: true
-          install: >-
-            make
-            zip
-            mingw-w64-ucrt-x86_64-gcc
-            mingw-w64-ucrt-x86_64-gtk4
-            mingw-w64-ucrt-x86_64-pkg-config
-            mingw-w64-ucrt-x86_64-make
-
-      - name: Build and bundle
-        env:
-          VERSION: ${{ github.ref_name }}
-        run: |
-          make bundle
-          cd dist
-          zip -qry ../maturita-windows-x64.zip .
-          cd ..
-          mkdir -p dist-out
-          mv maturita-windows-x64.zip dist-out/
-
-      - name: Upload artifact
-        uses: actions/upload-artifact@v4
-        with:
-          name: maturita-windows
-          path: dist-out/maturita-windows-x64.zip
-
-  macos:
-    name: macOS app
-    runs-on: macos-14
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Install dependencies
-        run: |
-          brew install gtk4 pkg-config
-
-      - name: Build .app zip
-        env:
-          VERSION: ${{ github.ref_name }}
-        run: |
-          chmod +x scripts/bundle-macos.sh
-          ./scripts/bundle-macos.sh
-
-      - name: Upload artifact
-        uses: actions/upload-artifact@v4
-        with:
-          name: maturita-macos
-          path: dist/maturita-macos-*.zip
-
-  publish:
-    name: Publish GitHub Release
-    needs: [linux, windows, macos]
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Download artifacts
-        uses: actions/download-artifact@v4
-        with:
-          path: release-assets
-          merge-multiple: true
-
-      # The installers carry no application: each downloads the newest release
-      # when the user runs it. The macOS one is zipped because a release asset
-      # loses its executable bit, which a .command needs to be double-clicked.
-      - name: Collect installers
-        run: |
-          cp installers/maturita-installer-linux.sh release-assets/
-          cp installers/maturita-installer-windows.cmd release-assets/
-          chmod +x installers/maturita-installer-macos.command
-          (cd installers && zip -q ../release-assets/maturita-installer-macos.zip \
-             maturita-installer-macos.command)
-
-      - name: List assets
-        run: find release-assets -type f -print
-
-      - name: Create release
-        uses: softprops/action-gh-release@v2
-        with:
-          files: |
-            release-assets/maturita-linux-*.AppImage
-            release-assets/maturita-windows-x64.zip
-            release-assets/maturita-macos-*.zip
-            release-assets/maturita-installer-macos.zip
-            release-assets/maturita-installer-windows.cmd
-            release-assets/maturita-installer-linux.sh
-          generate_release_notes: true
-          fail_on_unmatched_files: true
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}