ci: add workflow for builds

Signed-off-by: ozan956 <ozandurgut.2001@hotmail.com>

Author: ozan956

.github/workflows/build.yaml

@@ -0,0 +1,64 @@
+name: Build ADI br2-external
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout br2-external
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Install Buildroot dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y \
+            build-essential git gcc g++ make bc unzip file rsync \
+            cpio wget python3
+
+      - name: Cache Buildroot downloads
+        uses: actions/cache@v4
+        with:
+          path: buildroot/dl
+          key: ${{ runner.os }}-buildroot-dl-${{ hashFiles('**/configs/*.fragment', '**/configs/*.defconfig') }}
+          restore-keys: |
+            ${{ runner.os }}-buildroot-dl-
+
+      - name: Cache Buildroot output
+        uses: actions/cache@v4
+        with:
+          path: buildroot/output
+          key: buildroot-output-${{ github.sha }}
+          restore-keys: |
+            buildroot-output-
+
+      - name: Build ADI SC598 EZ-Kit image
+        run: |
+          cd buildroot
+
+          make BR2_EXTERNAL="${GITHUB_WORKSPACE}" adi_sc598_ezkit_defconfig
+
+          support/kconfig/merge_config.sh .config \
+            "${GITHUB_WORKSPACE}/configs/buildroot.fragment" \
+            "${GITHUB_WORKSPACE}/configs/debug.fragment"
+
+          make -j$(nproc)
+
+      - name: Upload Buildroot output images
+        if: success()
+        uses: actions/upload-artifact@v4
+        with:
+          name: buildroot-images
+          path: buildroot/output/images
+
+      - name: Upload build logs on failure
+        if: failure()
+        uses: actions/upload-artifact@v4
+        with:
+          name: build-logs
+          path: buildroot/output/build