Pin alpine versions to 3.18.0 (#3057)

* Revert "Bump alpine from 3.18.0 to 3.18.2 (#3044)"

This reverts commit c19a51e.

* Pin both images to alpine 3.18.0

Dockerfile

@@ -2,7 +2,7 @@
 # platform specific, it makes sense to build it in the docker
 
 #### Builder
-FROM hexpm/elixir:1.14.3-erlang-25.2.3-alpine-3.17.0 as buildcontainer
+FROM hexpm/elixir:1.14.3-erlang-25.2.3-alpine-3.18.0 as buildcontainer
 
 # preparation
 ENV MIX_ENV=prod
@@ -53,7 +53,7 @@ COPY rel rel
 RUN mix release plausible
 
 # Main Docker Image
-FROM alpine:3.18.2
+FROM alpine:3.18.0
 LABEL maintainer="plausible.io <[email protected]>"
 
 ARG BUILD_METADATA={}