github: Attempt to add a new workflow for aarch64

.github/workflows/aarch64.xml

@@ -0,0 +1,29 @@
+on: [push, workflow_dispatch]
+name: QEMU AArch64 virt
+jobs:
+  build-image:
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Clone Repository
+        uses: actions/checkout@v2
+        with:
+            fetch-depth: 0
+      - name: Clone Kuroko
+        uses: actions/checkout@v2
+        with:
+          repository: kuroko-lang/kuroko
+          path: kuroko
+      - name: Checkout Kuroko
+        run: git submodule update --init kuroko
+      - name: Pull Builder Image
+        run: docker pull toaruos/build-tools:aarch64
+      - name: Run Builder
+        run: docker run -v ${GITHUB_WORKSPACE}:/root/misaka -w /root/misaka -e LANG=C.UTF-8 -t toaruos/build-tools:aarch64 util/build-in-docker-aarch64.sh
+      - name: Upload Branch Image
+        uses: actions/upload-artifact@v2
+        with:
+          name: build
+          path: |
+            misaka-kernel
+            ramdisk.igz
+            bootstub

.github/workflows/x86_64.xml

@@ -1,5 +1,5 @@
 on: [push, workflow_dispatch]
-name: Build Image
+name: x86-64 CD Image
 jobs:
   build-image:
     runs-on: ubuntu-20.04

util/build-in-docker-aarch64.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+# Give other users access to /root
+# (We probably should have just built the build tools somewhere else...)
+chmod o+x /root
+chmod -R o+rw /root/gcc_local/bin
+
+# Who owns this directory?
+NEWUID=`stat -c '%u' .`
+
+if [[ "$NEWUID" == "0" ]]; then
+    echo "Are you running this on Docker for Mac? Owner UID is 0, going to use 501 instead."
+    NEWUID=501
+fi
+
+# Create a fake user with this name
+useradd -u $NEWUID local
+
+# Map the build tools
+ln -s /root/gcc_local util/local
+
+# Run make as local
+runuser -u local -- sh -c 'make ARCH=aarch64 base/lib/libc.so && make ARCH=aarch64 -j4' || exit 1
+
+# Remove the build tools
+rm util/local
+
+