Optimize APK update checks and CI builds

scripts/apk/package-lib.sh

@@ -106,7 +106,8 @@ apk_package_apk_names() {
     local pkgrel
     local subpackage
     local subpackages
-    export CARCH="${arch}"
+    # shellcheck disable=SC2034 # APKBUILD reads CARCH while sourced below.
+    local CARCH="${arch}"
     cd "${package_dir}" || exit 1
     # shellcheck source=/dev/null
     . ./APKBUILD
@@ -119,6 +120,31 @@ apk_package_apk_names() {
   )
 }
 
+apk_package_versioned_names() {
+  local package_dir="$1"
+  local arch="$2"
+
+  (
+    set +u
+    local pkgname
+    local pkgver
+    local pkgrel
+    local subpackage
+    local subpackages
+    # shellcheck disable=SC2034 # APKBUILD reads CARCH while sourced below.
+    local CARCH="${arch}"
+    cd "${package_dir}" || exit 1
+    # shellcheck source=/dev/null
+    . ./APKBUILD
+
+    printf '%s=%s-r%s\n' "${pkgname}" "${pkgver}" "${pkgrel}"
+    for subpackage in ${subpackages:-}; do
+      subpackage="${subpackage%%:*}"
+      printf '%s=%s-r%s\n' "${subpackage}" "${pkgver}" "${pkgrel}"
+    done
+  )
+}
+
 apk_container_package_dir() {
   local repo_root="$1"
   local package_dir="$2"