actions: Add arm build

.gitea/workflows/build.yml

@@ -45,6 +45,28 @@ jobs:
           docker push git.woodburn.au/nathanwoodburn/woodburn:$tag_num
           docker tag woodburn:$tag_num git.woodburn.au/nathanwoodburn/woodburn:latest
           docker push git.woodburn.au/nathanwoodburn/woodburn:latest
-          
+
+  Build ARM Docker:
+    runs-on: [ubuntu-latest, arm]
+    needs: CheckFiles
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Install Docker
+        run : |
+          apt-get install ca-certificates curl gnupg
+          install -m 0755 -d /etc/apt/keyrings
+          curl -fsSL https://download.docker.com/linux/debian/gpg | gpg --dearmor -o /etc/apt/keyrings/docker.gpg
+          chmod a+r /etc/apt/keyrings/docker.gpg
+          echo "deb [arch="$(dpkg --print-architecture)" signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/debian "$(. /etc/os-release && echo "$VERSION_CODENAME")" stable" | tee /etc/apt/sources.list.d/docker.list > /dev/null
+          apt-get update
+          apt-get install docker-ce-cli -y
+      - name: Build Docker image
+        run : |
+          echo "${{ secrets.DOCKERGIT_TOKEN }}" | docker login git.woodburn.au -u nathanwoodburn --password-stdin
+          tag_num=$(git rev-parse --short HEAD)
+          docker build -t woodburn:$tag_num .
+          docker tag woodburn:$tag_num git.woodburn.au/nathanwoodburn/woodburn:arm
+          docker push git.woodburn.au/nathanwoodburn/woodburn:arm