Dockerfile: bump Alpine from 3.20.0 to 3.22.1 (#125)

See release posts for 3.21.0, 3.22.0, and 3.22.1:

- https://www.alpinelinux.org/posts/Alpine-3.21.0-released.html
- https://www.alpinelinux.org/posts/Alpine-3.22.0-released.html
- https://www.alpinelinux.org/posts/Alpine-3.19.8-3.20.7-3.21.4-3.22.1-released.html

Author: ee7

Dockerfile

@@ -1,5 +1,5 @@
 ARG REPO=alpine
-ARG IMAGE=3.20.0@sha256:77726ef6b57ddf65bb551896826ec38bc3e53f75cdde31354fbffb4f25238ebd
+ARG IMAGE=3.22.1@sha256:eafc1edb577d2e9b458664a15f23ea1c370214193226069eb22921169fc7e43f
 FROM ${REPO}:${IMAGE} AS builder
 
 ARG VERSION=0.13.0