github actions: Make builds on Merge Request

Since we need to make sure external contributors code actually compiles
prior to merging. To get access to the forked repos merge request we
need to switch over our push/pull_request to pull_request_target.  In
addition we're fixing up some Naming Conventions, adding aarch64 to this
branch and fixing the naming so that we can quickly identify if the CI
is for x86_64 or aarch64.

Also disable the process-pull-request until the `utf-8` situation is
resolved.

.github/workflows/build-check_aarch64.yml

@@ -0,0 +1,34 @@
+name: aarch64 CI
+on:
+  pull_request_target:
+    branches:
+      - '**'
+      - '!mainline'
+
+jobs:
+  kernel-build-job:
+    runs-on:
+      labels: kernel-build-arm64
+    container:
+      image: rockylinux:8
+      env:
+        ROCKY_ENV: rocky8
+      ports:
+        - 80
+      options: --cpus 8
+    steps:
+      - name: Install tools and Libraries
+        run: |
+          dnf groupinstall 'Development Tools' -y
+          dnf install --enablerepo=devel bc dwarves kernel-devel openssl-devel elfutils-libelf-devel -y
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          ref: "${{ github.event.pull_request.head.sha }}"
+          fetch-depth: 0
+      - name: Build the Kernel
+        run: |
+          git config --global --add safe.directory /__w/kernel-src-tree/kernel-src-tree
+          cp configs/kernel-4.18.0-aarch64.config .config
+          make olddefconfig
+          make -j8

.github/workflows/push-check_x86_64.yml → .github/workflows/build-check_x86_64.yml

@@ -1,6 +1,6 @@
-name: CI
+name: x86_64 CI
 on:
-  push:
+  pull_request_target:
     branches:
       - '**'
       - '!mainline'
@@ -24,10 +24,11 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
         with:
+          ref: "${{ github.event.pull_request.head.sha }}"
           fetch-depth: 0
       - name: Build the Kernel
         run: |
-          git config --global --add safe.directory /__w/kernel-src-git/kernel-src-git
+          git config --global --add safe.directory /__w/kernel-src-tree/kernel-src-tree
           cp configs/kernel-4.18.0-x86_64.config .config
           make olddefconfig
           make -j8