Add cross-building on Github Action (#8)

Following platforms are added:

- armv7-unknown-linux-gnueabihf
- aarch64-linux-android --release
- mips-unknown-linux-musl

.github/workflows/build-package.yml

@@ -7,7 +7,7 @@ on:
 
 jobs:
   build-linux:
-    name: Build for
+    name: Build for Linux
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
@@ -40,3 +40,32 @@ jobs:
           artifacts: target/release/*.exe.xz
           token: ${{ secrets.GITHUB_TOKEN }}
           allowUpdates: true
+  build-linux-cross:
+    name: Cross-build for various on Linux
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/cargo@v1
+        with:
+          use-cross: true
+          command: build
+          args: --target armv7-unknown-linux-gnueabihf --release
+      - uses: actions-rs/cargo@v1
+        with:
+          use-cross: true
+          command: build
+          args: --target aarch64-linux-android --release
+      - uses: actions-rs/cargo@v1
+        with:
+          use-cross: true
+          command: build
+          args: --target mips-unknown-linux-musl --release
+      - run: xz -kfS "_${GITHUB_REF#*/v}_linux_armv7_gnueabihf.bin.xz" target/armv7-unknown-linux-gnueabihf/release/moproxy 
+      - run: xz -kfS "_${GITHUB_REF#*/v}_linux_aarch64_android.bin.xz" target/aarch64-linux-android/release/moproxy 
+      - run: xz -kfS "_${GITHUB_REF#*/v}_linux_mips_musl.bin.xz" target/mips-unknown-linux-musl/release/moproxy
+      - uses: ncipollo/release-action@v1
+        with:
+          artifacts: "target/**/*.bin.xz"
+          token: ${{ secrets.GITHUB_TOKEN }}
+          allowUpdates: true
+