feat: Add yq to act (#117)

* feat: update install script

* fix: revert toolset path

Since there's a lot of hard-coded references to this path.

* feat: Adds yq script

Unlike upstream we detect the arch suffix here.

* feat: include yq in act and custom flavors

* fix: include armhf in supported arch for act.yml

* fix: PR feedback, don't need to install twice for custom

linux/ubuntu/scripts/yq.sh

@@ -0,0 +1,29 @@
+#!/bin/bash -e
+################################################################################
+##  File:  yq.sh
+##  Desc:  Installs YQ
+##  Supply chain security: YQ - checksum validation
+################################################################################
+# source: https://github.com/actions/runner-images/blob/5d6938f680075d63fa71f8aa70990866cd12884b/images/linux/scripts/installers/yq.sh
+
+# Source the helpers for use with the script
+. /imagegeneration/installers/helpers/install.sh
+
+yq_arch() {
+  case "$(uname -m)" in
+    'aarch64') echo 'arm64' ;;
+    'x86_64') echo 'amd64' ;;
+    'armv7l') echo 'arm' ;;
+    *) exit 1 ;;
+  esac
+}
+
+# Download YQ
+base_url="https://github.com/mikefarah/yq/releases/latest/download"
+filename="yq_linux_$(yq_arch)"
+download_with_retries "${base_url}/${filename}" "/tmp" "yq"
+# Supply chain security - YQ
+external_hash=$(get_hash_from_remote_file "${base_url}/checksums" "${filename} " "" " " "19")
+use_checksum_comparison "/tmp/yq" "${external_hash}"
+# Install YQ
+sudo install /tmp/yq /usr/bin/yq