CI: move freebsd & android jobs in separate workflows

This because they are intermittent. When reviewing,
I wish we didn't have to scroll to check that it is indeed
freebsd or android failing.

.github/workflows/android.yml

@@ -0,0 +1,72 @@
+name: Android
+
+on: [push, pull_request]
+
+permissions:
+  contents: read # to fetch code (actions/checkout)
+
+# End the current execution if there is a new changeset in the PR.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}
+
+jobs:
+  test_android:
+    name: Test Android builds
+    runs-on: macos-latest
+    timeout-minutes: 90
+    strategy:
+      fail-fast: false
+      matrix:
+        api-level: [28]
+        target: [default]
+        arch: [x86] # , arm64-v8a
+    env:
+      TERMUX: v0.118.0
+      SCCACHE_GHA_ENABLED: "true"
+      RUSTC_WRAPPER: "sccache"
+    steps:
+    - uses: actions/checkout@v3
+    - uses: Swatinem/rust-cache@v2
+    - name: Run sccache-cache
+      uses: mozilla-actions/sccache-action@v0.0.3
+    - name: AVD cache
+      uses: actions/cache@v3
+      id: avd-cache
+      with:
+        path: |
+          ~/.android/avd/*
+          ~/.android/avd/*/snapshots/*
+          ~/.android/adb*
+        key: avd-${{ matrix.api-level }}-${{ matrix.arch }}+termux-${{ env.TERMUX }}
+    - name: Create and cache emulator image
+      if: steps.avd-cache.outputs.cache-hit != 'true'
+      uses: reactivecircus/android-emulator-runner@v2
+      with:
+        api-level: ${{ matrix.api-level }}
+        target: ${{ matrix.target }}
+        arch: ${{ matrix.arch }}
+        ram-size: 2048M
+        disk-size: 5120M
+        force-avd-creation: true
+        emulator-options: -no-snapshot-load -noaudio -no-boot-anim -camera-back none
+        script: |
+          wget https://github.com/termux/termux-app/releases/download/${{ env.TERMUX }}/termux-app_${{ env.TERMUX }}+github-debug_${{ matrix.arch }}.apk
+          util/android-commands.sh snapshot termux-app_${{ env.TERMUX }}+github-debug_${{ matrix.arch }}.apk
+          adb -s emulator-5554 emu avd snapshot save ${{ matrix.api-level }}-${{ matrix.arch }}+termux-${{ env.TERMUX }}
+          echo "Emulator image created."
+          pkill -9 qemu-system-x86_64
+    - name: Build and Test on Android
+      uses: reactivecircus/android-emulator-runner@v2
+      with:
+        api-level: ${{ matrix.api-level }}
+        target: ${{ matrix.target }}
+        arch: ${{ matrix.arch }}
+        ram-size: 2048M
+        disk-size: 5120M
+        force-avd-creation: false
+        emulator-options: -no-snapshot-save -gpu swiftshader_indirect -noaudio -no-boot-anim -camera-back none -snapshot ${{ matrix.api-level }}-${{ matrix.arch }}+termux-${{ env.TERMUX }}
+        script: |
+          util/android-commands.sh sync
+          util/android-commands.sh build
+          util/android-commands.sh tests