chore: Fix nightly build and publish a phone-sized Android APK

.github/workflows/nightly.yml

@@ -24,7 +24,7 @@ jobs:
         run: |
           HEAD_SHA=$(git rev-parse HEAD)
           PREV_SHA=$(gh api "repos/${{ github.repository }}/git/refs/tags/nightly" \
-            --jq '.object.sha' 2>/dev/null || true)
+            --jq '.object.sha' 2>/dev/null) || PREV_SHA=
 
           if [ "$HEAD_SHA" = "$PREV_SHA" ]; then
             echo "No new commits on main since last nightly build ($HEAD_SHA); skipping."
@@ -44,7 +44,8 @@ jobs:
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
-          RELEASE_ID=$(gh api "repos/${{ github.repository }}/releases/tags/nightly" --jq '.id' 2>/dev/null || true)
+          # On 404, gh prints the error JSON to stdout, so discard output on failure.
+          RELEASE_ID=$(gh api "repos/${{ github.repository }}/releases/tags/nightly" --jq '.id' 2>/dev/null) || RELEASE_ID=
 
           if [ -n "$RELEASE_ID" ]; then
             echo "Deleting existing nightly release"
@@ -140,8 +141,12 @@ jobs:
   # since the Android/iOS toolchains are slow; signed builds live in mobile.yml.
   android:
     name: android build (unsigned debug)
-    needs: check
-    if: needs.check.outputs.should_run == 'true'
+    # After release, so the nightly release exists to attach the APK to.
+    needs: [check, release]
+    # Still build if one desktop target fails; the release exists either way.
+    if: ${{ !cancelled() && needs.check.outputs.should_run == 'true' }}
+    permissions:
+      contents: write
     runs-on: ubuntu-22.04
     timeout-minutes: 30
     steps:
@@ -158,7 +163,7 @@ jobs:
         uses: dtolnay/rust-toolchain@v1
         with:
           toolchain: stable
-          targets: aarch64-linux-android,armv7-linux-androideabi,i686-linux-android,x86_64-linux-android
+          targets: aarch64-linux-android
 
       - uses: Swatinem/rust-cache@v2
         with:
@@ -188,10 +193,14 @@ jobs:
           NDK_HOME: ${{ env.ANDROID_HOME }}/ndk/27.0.12077973
         run: npm run mobile:android:init
 
+      # arm64 only, without debug symbols: the universal unstripped build
+      # is ~2.4 GB, too big to sideload. This keeps it under ~100 MB.
       - name: Build unsigned debug APK
         env:
           NDK_HOME: ${{ env.ANDROID_HOME }}/ndk/27.0.12077973
-        run: npm run mobile:android:build -- --debug
+          CARGO_PROFILE_DEV_DEBUG: "false"
+          CARGO_PROFILE_DEV_STRIP: "true"
+        run: npm run mobile:android:build -- --debug --apk --target aarch64
 
       - name: Upload APK
         uses: actions/upload-artifact@v4
@@ -201,6 +210,14 @@ jobs:
           if-no-files-found: error
           retention-days: 7
 
+      - name: Attach APK to nightly release
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          APK=$(find src-tauri/gen/android/app/build/outputs/apk -name '*.apk' | head -n1)
+          cp "$APK" treq-nightly-android-arm64.apk
+          gh release upload nightly treq-nightly-android-arm64.apk --clobber
+
   ios:
     name: ios build (unsigned debug)
     needs: check

web/docs/getting-started/installation.mdx

@@ -17,6 +17,12 @@ Download the latest version for your platform from the GitHub Releases page.
 
 [View Releases](https://github.com/Ziinc/treq/releases)
 
+### Nightly builds
+
+A nightly build of `main` is published each day there are new commits. It has the same desktop targets plus an arm64 Android debug APK (`treq-nightly-android-arm64.apk`). Nightly builds are untested prereleases, so expect bugs.
+
+[Download the nightly build](https://github.com/treq-dev/treq/releases/tag/nightly)
+
 Treq works with ordinary Git repositories. You do not need to install or learn [Jujutsu](https://docs.jj-vcs.dev/latest/install-and-setup/) to use it. Treq initializes colocated Jujutsu metadata itself when you open a repo, and it runs Git and Jujutsu operations [under the hood](/docs/under-the-hood).
 
 :::tip[Optional: install `jj` only for power-user debugging]