Mobile (Android/iOS) support

.github/workflows/ci.yml

@@ -131,6 +131,7 @@ jobs:
     env:
       RUST_CARGO_COMMAND: ${{ matrix.platform.cross == true && 'cross' || 'cargo' }}
     strategy:
+      fail-fast: false
       matrix:
         platform:
           - {
@@ -157,6 +158,22 @@ jobs:
               command: "test",
               args: "--all --tests",
             }
+          - {
+              name: ios,
+              target: aarch64-apple-ios,
+              os: macos-latest,
+              cross: false,
+              command: "build",
+              args: "--all",
+            }
+          - {
+              name: android,
+              target: aarch64-linux-android,
+              os: ubuntu-latest,
+              cross: true,
+              command: "build",
+              args: "--all",
+            }
 
     name: Test (${{ matrix.platform.name }})
 
@@ -169,17 +186,23 @@ jobs:
           targets: ${{ matrix.platform.target }}
           components: rustfmt
 
+      # Install cross from source. Because latest release doesn't work with recent Rust
+      # when targeting Android. See https://github.com/cross-rs/cross/issues/1222
       - name: Install cross
         if: ${{ matrix.platform.cross == true }}
-        uses: taiki-e/install-action@cross
-
-      - name: Free Disk Space (Ubuntu)
-        if: ${{ matrix.platform.os == 'ubuntu-latest' }}
-        uses: jlumbroso/free-disk-space@v1.3.1
-        with: # speed things up a bit
-          large-packages: false
-          docker-images: false
-          swap-storage: false
+        run: cargo install cross --git https://github.com/cross-rs/cross --rev 426e811
+
+      # This is currently disabled as Blitz's CI doesn't need the extra disk space.
+      # So this task is just taking up time for no reason. We will reinstate if our
+      # disk space requirement increase.
+      #
+      # - name: Free Disk Space (Ubuntu)
+      #   if: ${{ matrix.platform.os == 'ubuntu-latest' }}
+      #   uses: jlumbroso/free-disk-space@v1.3.1
+      #   with: # speed things up a bit
+      #     large-packages: false
+      #     docker-images: false
+      #     swap-storage: false
 
       - uses: Swatinem/rust-cache@v2
         with:
@@ -191,7 +214,7 @@ jobs:
         if: ${{ matrix.platform.os == 'ubuntu-latest' }}
         uses: awalsh128/cache-apt-pkgs-action@latest
         with:
-          packages: libasound2-dev libatk1.0-dev libgtk-3-dev libudev-dev libpango1.0-dev libxdo-dev
+          packages: libasound2-dev libatk1.0-dev libgtk-3-dev libudev-dev libpango1.0-dev libxdo-dev libssl-dev
           version: 1.0
 
       - name: Setup