abuild: warn for more version suffixes

give a warning when version suffix a<digit>/b<digit> probably should be
_alpha<digit>/_beta<digit>.

ref: https://gitlab.alpinelinux.org/alpine/apk-tools/-/issues/10972#note_380899

abuild.in

@@ -200,10 +200,16 @@ default_sanitycheck() {
 	# give 0 as it is always valid and give the pkgrel
 	$APK version --check --quiet 0-r"$pkgrel" || \
 		die "$pkgrel is not a valid pkgrel"
-	# warn when p1 should be _p1
-	case "$pkgver" in
-		*[0-9]p[0-9]) warning "pkgver should probably be $(echo "$pkgver" | sed -E -e 's/(.*[0-9])p([0-9])/\1_p\2/')";;
-	esac
+
+	# warn when <letter><digit> should be <suffix><digit>
+	# eg p1 -> _p1, a5 -> _alpha5 and b10 -> _beta10
+	suggestion=$(echo "$pkgver" | sed -E \
+		-e 's/(.*[0-9])a([0-9]+)$/\1_alpha\2/' \
+		-e 's/(.*[0-9])b([0-9]+)$/\1_beta\2/' \
+		-e 's/(.*[0-9])p([0-9]+)$/\1_p\2/')
+	if [ "$pkgver" != "$suggestion" ]; then
+		warning "Did you mean 'pkgver=$suggestion'?"
+	fi
 	[ -z "$pkgdesc" ] && die "Missing pkgdesc in APKBUILD"
 	[ -z "$url" ] && die "Missing url in APKBUILD"
 	[ -z "$license" ] && die "Missing license in APKBUILD"

tests/abuild_test

@@ -26,7 +26,7 @@ init_tests \
 	abuild_subpackage_arch \
 	abuild_large_doc_subpackage \
 	abuild_bigdocs \
-	abuild_warn_pkgver_patch_version \
+	abuild_warn_pkgver_suffix \
 	abuild_multiline_license \
 	abuild_license_spdx \
 	abuild_git_ceiling \
@@ -485,7 +485,7 @@ abuild_bigdocs_body() {
 		abuild all
 }
 
-abuild_warn_pkgver_patch_version_body() {
+abuild_warn_pkgver_suffix_body() {
 	cp -ra "$testrepo"/test-pkgname .
 	cd test-pkgname
 	TESTPKGVER=1.0_p1 atf_check -s exit:0 \
@@ -494,6 +494,12 @@ abuild_warn_pkgver_patch_version_body() {
 	TESTPKGVER=1.0p1 atf_check -s exit:0 \
 		-e match:'WARNING.*1.0_p1' \
 		abuild sanitycheck
+	TESTPKGVER=1.0a1 atf_check -s exit:0 \
+		-e match:'WARNING.*1.0_alpha1' \
+		abuild sanitycheck
+	TESTPKGVER=1.0b10 atf_check -s exit:0 \
+		-e match:'WARNING.*1.0_beta10' \
+		abuild sanitycheck
 }
 
 abuild_multiline_license_body() {