Revert "Update Go Dockerfile to use a separate directory for caching"

This reverts commit b5bdb25.

Author: rohitpaulk

dockerfiles/go-1.22.Dockerfile

@@ -2,11 +2,6 @@ FROM golang:1.22-alpine
 
 ENV CODECRAFTERS_DEPENDENCY_FILE_PATHS="go.mod,go.sum"
 
-# By default, Go uses $HOME for GOCACHE. We need to override $HOME in some tests,
-# so let's ensure Go uses a different directory for caching.
-RUN mkdir -p /cache
-ENV GOCACHE=/cache
-
 WORKDIR /app
 
 COPY go.mod go.sum ./