⚡ Speed up go toolchain container startup ⚡

Pre-set service-discovery vars in a Docker env file so the entrypoint's
${VAR:-$(function)} expansions skip all seven __find_* subprocess forks on
every container start. Also suppress the startup banner and health loop
since this image has no long-running daemon.
Fix overly-broad `env/` gitignore pattern that silently swallowed
rootfs/…/docker/env/ and any other env directory in the tree. Replace with
the root-anchored `/env/` and `src/env/` which only match the Python venv
paths originally intended.
- rootfs/usr/local/etc/docker/env/go.sh: new — pre-sets PHP_INI_DIR,
PHP_BIN_DIR, HTTPD_CONFIG_FILE, NGINX_CONFIG_FILE, MYSQL_CONFIG_FILE,
PGSQL_CONFIG_FILE, MONGODB_CONFIG_FILE to "none"; sets
ENTRYPOINT_MESSAGE=no and HEALTH_ENABLED=no
- .gitignore: replace bare `env/` with `/env/` and `src/env/` to avoid
matching Docker env config directories inside rootfs

.gitignore
rootfs/usr/local/etc/docker/env/

rootfs/usr/local/etc/docker/env/go.sh

@@ -0,0 +1,14 @@
+# Go toolchain image — pre-set service-discovery vars to skip __find_* subprocess forks
+# The entrypoint sources this before the ${VAR:-$(function)} expansions, so each
+# non-empty assignment here silently short-circuits the matching find call.
+PHP_INI_DIR="none"
+PHP_BIN_DIR="none"
+HTTPD_CONFIG_FILE="none"
+NGINX_CONFIG_FILE="none"
+MYSQL_CONFIG_FILE="none"
+PGSQL_CONFIG_FILE="none"
+MONGODB_CONFIG_FILE="none"
+
+# This image has no long-running daemon; suppress the startup banner and health loop
+ENTRYPOINT_MESSAGE="no"
+HEALTH_ENABLED="no"