add aarch64 CI to GH actions

we had a drone CI, but this was disabled and failed.
add relprep and the aarch64-m1 branch.

.drone.yml

@@ -17,8 +17,10 @@ steps:
 # https://docker-runner.docs.drone.io/configuration/trigger/
 trigger:
   branch:
+    - aarch64-m1
     - archs
     - master
+    - relprep
 
 ---
 kind: pipeline
@@ -36,9 +38,10 @@ steps:
       - apt-get install -yq --no-install-suggests --no-install-recommends
                 build-essential file bash gcc make autotools-dev automake autoconf libtool
                 libtext-diff-perl pkg-config
-      - build-aux/autogen.sh
       - build-aux/conf-make-check.sh
 trigger:
   branch:
+    - aarch64-m1
     - archs
     - master
+    - relprep

.github/workflows/main.yml

@@ -142,3 +142,23 @@ jobs:
     #    asset_path: ./configure.gz
     #    asset_name: configure.gz
     #    asset_content_type: application/gzip
+  aarch64:
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+      - uses: actions/checkout@v4
+      - uses: uraimo/[email protected]
+        name: Check on aarch64
+        id: runcmd
+        with:
+          arch: aarch64
+          githubToken: ${{ github.token }}
+          distro: ubuntu_latest
+          install: |
+            apt-get update -q -y
+            apt-get install -y make gcc grep bash file git libtool automake autoconf \
+                               libtext-diff-perl pkg-config
+            git config --global --add safe.directory /home/runner/work/safeclib/safeclib
+          run: |
+            build-aux/autogen.sh
+            build-aux/conf-make-check.sh