Split formatting to a separate job

.github/workflows/ci.yml

@@ -16,9 +16,9 @@ jobs:
 
       - uses: actions-rs/toolchain@v1
         with:
+          profile: minimal
           toolchain: stable
           override: true
-          components: rustfmt
 
       - name: Install Rust targets
         run: >
@@ -70,6 +70,18 @@ jobs:
           -t x86
           -o app/src/main/jniLibs/ -- build
 
+  format:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+          components: rustfmt
+
       - name: Format
         run: cargo fmt --all -- --check
         working-directory: android-activity