Pin to Alpine 3.22 (#50)

The version of openresolv in Alpine 3.23 breaks the Wireguard
container with:

    resolvconf: signature mismatch: /etc/resolv.conf

For now, use an older version of openresolv until the community
determines a better solution.

Example discussion:
https://www.linuxquestions.org/questions/slackware-14/openresolv-3-17-0-breaks-bringing-up-my-wireguard-vpn-4175751894/

Co-authored-by: Jordan Potter <[email protected]>

Dockerfile

@@ -1,7 +1,7 @@
-FROM alpine:3
+FROM alpine:3.22
 
 RUN apk add --no-cache \
-	findutils openresolv iptables ip6tables iproute2 wireguard-tools
+    findutils openresolv iptables ip6tables iproute2 wireguard-tools
 
 COPY entrypoint.sh /entrypoint.sh