Add workflow to test the plugin build.

Author: Rot127

.github/workflows/build.yaml

@@ -0,0 +1,40 @@
+name: Build target user
+
+on: [pull_request, workflow_dispatch]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python 3.x
+      uses: actions/setup-python@v4
+      with:
+        python-version: '3.x'
+    - name: Install deps
+      run: |
+        sudo apt-get update
+        sudo apt-get --no-install-recommends -y build-dep qemu
+        sudo apt-get install -y autoconf libtool protobuf-c-compiler libprotobuf-c-dev
+        pip3 install --user ninja
+    - name: Install OCaml
+      uses: ocaml/setup-ocaml@v2
+      with:
+        ocaml-compiler: 4.14.x
+        dune-cache: true
+        opam-disable-sandboxing: true
+    - name: Install piqi
+      run: |
+        opam install piqi
+    - name: Checkout qemu
+      uses: actions/checkout@v4
+      with:
+        repository: BinaryAnalysisPlatform/qemu
+        path: qemu
+    - name: Build for Hexagon
+      run: |
+        cd qemu
+        mkdir build
+        cd build
+        ../configure --enable-plugins --target-list=parc-linux-user,sparc64-linux-user
+        ninja