github: add mobile compilation to GitHub workflow

.github/workflows/main.yml

@@ -158,6 +158,50 @@ jobs:
       - name: build release for architecture
         run: make release sys=${{ matrix.build_sys }}
 
+  ########################
+  # mobile compilation
+  ########################
+  mobile-compile:
+    name: mobile compilation
+    runs-on: ubuntu-latest
+    steps:
+      - name: git checkout
+        uses: actions/checkout@v2
+
+      - name: go cache
+        uses: actions/cache@v1
+        with:
+          path: /home/runner/work/go
+          key: lnd-${{ runner.os }}-go-${{ env.GO_VERSION }}-${{ github.job }}-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            lnd-${{ runner.os }}-go-${{ env.GO_VERSION }}-${{ github.job }}-${{ hashFiles('**/go.sum') }}
+            lnd-${{ runner.os }}-go-${{ env.GO_VERSION }}-${{ github.job }}-
+            lnd-${{ runner.os }}-go-${{ env.GO_VERSION }}-
+            lnd-${{ runner.os }}-go-
+
+      - name: setup go ${{ env.GO_VERSION }}
+        uses: actions/setup-go@v2
+        with:
+          go-version: '~${{ env.GO_VERSION }}'
+
+      - name: download cache
+        uses: actions/cache@v1
+        with:
+          path: /home/runner/work/download_cache
+          key: lnd-${{ runner.os }}-download-${{ hashFiles('**/install_travis_proto.sh') }}
+          restore-keys: |
+            lnd-${{ runner.os }}-download-${{ hashFiles('**/install_travis_proto.sh') }}
+            lnd-${{ runner.os }}-download-
+
+      - name: install protoc and protobuf libraries
+        run: ./scripts/install_travis_proto.sh
+
+      - name: build mobile RPC bindings
+        run: make mobile-rpc
+
+      - name: build mobile specific code
+        run: go build --tags="mobile" ./mobile
+
   ########################
   # run unit tests
   ########################