build: Add hyperion.ng reference as submodule

Author: alixinne

.github/workflows/build.yml

@@ -21,6 +21,8 @@ jobs:
     steps:
       - name: Checkout source code
         uses: actions/checkout@v2
+        with:
+          submodules: true
 
       - uses: actions/cache@v2
         with:

.github/workflows/release.yml

@@ -23,6 +23,8 @@ jobs:
     steps:
       - name: Checkout source code
         uses: actions/checkout@v2
+        with:
+          submodules: true
 
       - name: Install Rust toolchain
         uses: actions-rs/toolchain@v1

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "ext/hyperion.ng"]
+	path = ext/hyperion.ng
+	url = https://github.com/hyperion-project/hyperion.ng.git