[WIP] GCC Building + libhackerultra (#17)

Co-authored-by: a <a>

lib/hackerlibultra/.github/workflows/ci_gcc.yml

@@ -0,0 +1,35 @@
+# CI file for GCC builds
+
+name: Build GCC libgultra
+
+# Build on every branch push, tag push, and pull request change:
+on: [push, pull_request_target]
+
+jobs:
+  build_repo:
+    name: Build repo
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        version: [L] # [H, I, I_patch, J, K, L]
+        suffix: [~, _d, _rom]
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v3
+      with:
+        ref: ${{ github.event.pull_request.head.sha }}
+
+    - name: Install package requirements
+      run: sudo apt-get install -y clang-tools clang-format clang-tidy gcc-mips-linux-gnu binutils-mips-linux-gnu build-essential python3
+
+    - name: Verify formatting on all files
+      run: python3 tools/check_format.py --verbose
+
+    - name: Setup
+      run: make setup -j $(nproc) TARGET=libgultra${{ matrix.suffix }} VERSION=${{ matrix.version }}
+
+    - name: Build libgultra${{ matrix.suffix }} ${{ matrix.version }}
+      run: make -j $(nproc) TARGET=libgultra${{ matrix.suffix }} VERSION=${{ matrix.version }}