CI: Build DAHDI against custom kernels.

To better test DAHDI against more recent kernels, compile
the kernel ourselves and build DAHDI against it, including
any patches necessary to successfully do so.

Author: InterLinked1

.github/workflows/main.yml

@@ -16,6 +16,105 @@ on:
 # kernel-devel mismatch has been detected. Package provides 6.12.0-0.rc0.20240918git4a39ac5b7d62, but running kernel is 6.8.0-1014-azure
 
 jobs:
+  dahdi-kernel-mainline:
+    runs-on: ubuntu-24.04
+    name: DAHDI, mainline kernel
+    container: debian:12
+    steps:
+     - name: Install packages
+       run: |
+          apt-get -y update
+          apt-get -y upgrade
+          apt-get -y install git gcc make perl-modules flex bison wget libssl-dev libelf-dev bc
+     - name: Clone kernel
+       run: |
+          cd /usr/src
+          git clone --depth 1 git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
+     - name: Build kernel
+       run: |
+          cd /usr/src/linux
+          make -j$(nproc) kernelversion
+          make -j$(nproc) x86_64_defconfig
+          make -j$(nproc) modules_prepare
+          make -j$(nproc)
+          make -j$(nproc) modules
+     - name: Checkout
+       uses: actions/checkout@v4
+     - name: Build DAHDI
+       run: |
+           ./phreaknet.sh make
+           KSRC=/usr/src/linux phreaknet dahdi --drivers
+  dahdi-kernel-next:
+    runs-on: ubuntu-24.04
+    name: DAHDI, next kernel
+    container: debian:12
+    steps:
+     - name: Install packages
+       run: |
+          apt-get -y update
+          apt-get -y upgrade
+          apt-get -y install git gcc make perl-modules flex bison wget libssl-dev libelf-dev bc
+     - name: Clone kernel
+       run: |
+          cd /usr/src
+          git clone --depth 1 git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
+     - name: Build kernel
+       run: |
+          cd /usr/src/linux-next
+          make -j$(nproc) kernelversion
+          make -j$(nproc) x86_64_defconfig
+          make -j$(nproc) modules_prepare
+          make -j$(nproc)
+          make -j$(nproc) modules
+     - name: Checkout
+       uses: actions/checkout@v4
+     - name: Build DAHDI
+       run: |
+           ./phreaknet.sh make
+           KSRC=/usr/src/linux-next phreaknet dahdi --drivers
+  dahdi-kernel-stable:
+    runs-on: ubuntu-24.04
+    name: DAHDI, stable kernel
+    container: debian:12
+    strategy:
+      fail-fast: false
+      matrix:
+        kernel_branch: [
+          'linux-4.14.y',
+          'linux-4.19.y',
+          'linux-5.4.y',
+          'linux-5.10.y',
+          'linux-5.15.y',
+          'linux-6.1.y',
+          'linux-6.5.y',
+          'linux-6.6.y',
+          'linux-6.7.y',
+          'linux-6.8.y'
+          ]
+    steps:
+     - name: Install packages
+       run: |
+          apt-get -y update
+          apt-get -y upgrade
+          apt-get -y install git gcc make perl-modules flex bison wget libssl-dev libelf-dev bc
+     - name: Clone kernel
+       run: |
+          cd /usr/src
+          git clone --depth 1 --branch ${{matrix.kernel_branch}} git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
+     - name: Build kernel
+       run: |
+          cd /usr/src/linux
+          make -j$(nproc) kernelversion
+          make -j$(nproc) x86_64_defconfig
+          make -j$(nproc) modules_prepare
+          make -j$(nproc)
+          make -j$(nproc) modules
+     - name: Checkout
+       uses: actions/checkout@v4
+     - name: Build DAHDI
+       run: |
+           ./phreaknet.sh make
+           KSRC=/usr/src/linux phreaknet dahdi --drivers
   ubuntu-latest:
     runs-on: ubuntu-24.04
     name: Ubuntu 24.04