Fixed drush in CI

local/drupal/Dockerfile

@@ -18,7 +18,10 @@ RUN apk add --no-cache \
   gnupg
 
 COPY entrypoints/ /entrypoints
-RUN chmod +x /entrypoints/*
+COPY files/usr /usr
+RUN chmod +x /entrypoints/* \
+    # Drush binary is needed in CI.
+    /usr/local/bin/drush
 
 COPY files/etc/nginx /etc/nginx
 

local/drupal/files/usr/local/bin/drush

@@ -0,0 +1,18 @@
+#!/bin/sh
+
+# Start at the current directory
+dir=$PWD
+
+# While not at the root (/)
+while [[ "$dir" != "/" ]]; do
+  # If vendor/bin/drush exists, run it
+  if [[ -x "$dir/vendor/bin/drush" ]]; then
+    "$dir/vendor/bin/drush" "$@"
+    exit $?
+  fi
+  # Go up one directory level
+  dir=$(dirname "$dir")
+done
+
+echo "Could not find drush in any parent directory."
+exit 1