Set HOMEBREW_TEMP to something shorter

This fixes unix socket errors, because there's a max path length for
those.

.gitlab-ci.yml

@@ -186,8 +186,8 @@ variables:
     - export HOMEBREW_CACHE=$CI_PROJECT_DIR/.brew_cache
     - mkdir -p $CI_PROJECT_DIR/.brew_logs
     - export HOMEBREW_LOGS=$CI_PROJECT_DIR/.brew_logs
-    - mkdir -p $CI_PROJECT_DIR/.brew_tmp
-    - export HOMEBREW_TEMP=$CI_PROJECT_DIR/.brew_tmp
+    - mkdir -p /private/tmp/.brew_tmp
+    - export HOMEBREW_TEMP=/private/tmp/.brew_tmp
 
     # update and install packages
     - brew update
@@ -545,8 +545,8 @@ release:darwin:aarch64:
     - export HOMEBREW_CACHE=$CI_PROJECT_DIR/.brew_cache
     - mkdir -p $CI_PROJECT_DIR/.brew_logs
     - export HOMEBREW_LOGS=$CI_PROJECT_DIR/.brew_logs
-    - mkdir -p $CI_PROJECT_DIR/.brew_tmp
-    - export HOMEBREW_TEMP=$CI_PROJECT_DIR/.brew_tmp
+    - mkdir -p /private/tmp/.brew_tmp
+    - export HOMEBREW_TEMP=/private/tmp/.brew_tmp
 
     # update and install packages
     - brew update

.gitlab/after_script.sh

@@ -12,4 +12,8 @@ if [ "${OS}" = "WINDOWS" ] ; then
 	rm -Rf /c/ghcup
 fi
 
+if [ "${OS}" = "DARWIN" ] ; then
+	rm -Rf /private/tmp/.brew_tmp
+fi
+
 exit 0