packages: add Alpine 21, drop Alpine 18

Signed-off-by: Davide Madrisan <d.madrisan@proton.me>

Author: madrisan

.github/workflows/build-checks.yml

@@ -16,8 +16,8 @@ jobs:
       fail-fast: false
       matrix:
         container:
-          - 'alpine:3.19'
           - 'alpine:3.20'
+          - 'alpine:3.21'
           - 'debian:11'
           - 'debian:12'
           - 'fedora:41'

README.md

@@ -126,9 +126,9 @@ The `.apk`, `.rpm` and `.deb` packages for Alpine, CentOS/RHEL, Debian, and Fedo
 
 Command              | Distribution
 -------------------- | ------------
-Alpine 3.18          | `make -C packages alpine-3.18`
 Alpine 3.19          | `make -C packages alpine-3.19`
 Alpine 3.20          | `make -C packages alpine-3.20`
+Alpine 3.21          | `make -C packages alpine-3.21`
 CentOS Stream 8      | `make -C packages centos-stream-8`
 CentOS Stream 9      | `make -C packages centos-stream-9`
 Debian 10 (Buster)   | `make -C packages debian-buster`

packages/Makefile.am

@@ -33,10 +33,10 @@ MULTIBUILD_OPTS = \
 	--pckver $(PACKAGE_VERSION)
 
 TARGETS_ALPINE = \
-	alpine-3.18 \
 	alpine-3.19 \
-	alpine-3.20
-alpine-latest: alpine-3.20
+	alpine-3.20 \
+	alpine-3.21
+alpine-latest: alpine-3.21
 
 TARGETS_CENTOS_STREAM = \
 	centos-stream-8 centos-stream-9