Switch autobuild OS to ARM runner

Author: ann0see

.github/autobuild/linux_deb.sh

@@ -50,6 +50,7 @@ esac
 
 setup() {
     export DEBIAN_FRONTEND="noninteractive"
+    export APT_ARCH="$(dpkg --print-architecture)"
 
     setup_cross_compilation_apt_sources
 
@@ -61,18 +62,22 @@ setup() {
 }
 
 setup_cross_compilation_apt_sources() {
-    if [[ "${TARGET_ARCH}" == amd64 ]]; then
+    if [[ "${TARGET_ARCH}" == "${APT_ARCH}" ]]; then
         return
     fi
+    echo "Building on ${APT_ARCH} for ${TARGET_ARCH}. Thus modifying apt..." 
     sudo dpkg --add-architecture "${TARGET_ARCH}"
-    # Duplicate the original Ubuntu sources and modify them to refer to the TARGET_ARCH:
-    sed -rne "s|^deb.*/ ([^ -]+(-updates)?) main.*|deb [arch=${TARGET_ARCH}] http://ports.ubuntu.com/ubuntu-ports \1 main universe multiverse restricted|p" /etc/apt/sources.list | sudo dd of=/etc/apt/sources.list.d/"${TARGET_ARCH}".list
-    # Now take the original Ubuntu sources and limit those to the build host (i.e. non-TARGET_ARCH) architectures:
-    sudo sed -re 's/^deb /deb [arch=amd64,i386] /' -i /etc/apt/sources.list
+
+    if [[  "${APT_ARCH}" == "amd64" ]]; then
+        # Duplicate the original Ubuntu sources and modify them to refer to the TARGET_ARCH:
+        sed -rne "s|^deb.*/ ([^ -]+(-updates)?) main.*|deb [arch=${TARGET_ARCH}] http://ports.ubuntu.com/ubuntu-ports \1 main universe multiverse restricted|p" /etc/apt/sources.list | sudo dd of=/etc/apt/sources.list.d/"${TARGET_ARCH}".list
+        # Now take the original Ubuntu sources and limit those to the build host (i.e. non-TARGET_ARCH) architectures:
+        sudo sed -re 's/^deb /deb [arch=amd64,i386] /' -i /etc/apt/sources.list
+    fi
 }
 
 setup_cross_compiler() {
-    if [[ "${TARGET_ARCH}" == amd64 ]]; then
+    if [[ "${TARGET_ARCH}" == "${APT_ARCH}" ]]; then
         return
     fi
     local GCC_VERSION=9  # 9 is the default on 20.04, there is no reason not to update once 20.04 is out of support

.github/workflows/autobuild.yml

@@ -212,14 +212,14 @@ jobs:
 
           - config_name:            Linux .deb armhf (artifacts)
             target_os:              linux
-            building_on_os:         ubuntu-22.04
+            building_on_os:         ubuntu-22.04-arm
             building_container:     ubuntu:20.04
             base_command:           TARGET_ARCH=armhf ./.github/autobuild/linux_deb.sh
             run_codeql:             false
 
           - config_name:            Linux .deb arm64 (artifacts)
             target_os:              linux
-            building_on_os:         ubuntu-22.04
+            building_on_os:         ubuntu-22.04-arm
             building_container:     ubuntu:20.04
             base_command:           TARGET_ARCH=arm64 ./.github/autobuild/linux_deb.sh
             run_codeql:             false