Add alpine 3.21 support (#1021)

Author: pdabelf5

Makefile

@@ -22,7 +22,7 @@ GOBIN 	?= $$(go env GOPATH)/bin
 # | redhatenterprise | 8, 9                                  	 |                                                                |
 # | rockylinux       | 8, 9                                      |                                                                |
 # | almalinux        | 8, 9                                      |                                                                |
-# | alpine           | 3.17, 3.18, 3.19, 3.20                    |                                                                |
+# | alpine           | 3.17, 3.18, 3.19, 3.20, 3.21              |                                                                |
 # | oraclelinux      | 8, 9                                		 |                                                                |
 # | suse             | sles12sp5, sle15                          |                                                                |
 # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #

Makefile.packaging

@@ -22,7 +22,7 @@ REDHAT_ARCHS        ?= aarch64 x86_64
 ROCKY_VERSIONS      ?= rocky-8 rocky-9
 ROCKY_ARCHS         ?= aarch64 x86_64
 FREEBSD_DISTROS     ?= "FreeBSD:13:amd64" "FreeBSD:14:amd64" 
-APK_VERSIONS        ?= 3.17 3.18 3.19 3.20
+APK_VERSIONS        ?= 3.17 3.18 3.19 3.20 3.21
 APK_ARCHS           ?= aarch64 x86_64
 ALMA_VERSIONS       ?= almalinux-8 almalinux-9
 ALMA_ARCHS          ?= aarch64 x86_64