Allow setting auth_token at 1st container startup

Removing or renaming machines or runs require to have an auth_token.
This commit adds a mechanism to set that token on first startup of the
LNT container by setting the LNT_AUTH_TOKEN environment variable.

Reviewed By: tnfchris, PrzemekWirkus, cmatthews

Differential Revision: https://reviews.llvm.org/D113470

Author: Thomas Preud'homme

docker/docker-compose.yml

@@ -10,6 +10,7 @@ services:
       - DB_ENGINE=postgres
       - DB_HOST=lnt-postgres
       - DB_PWD
+      - LNT_AUTH_TOKEN
     depends_on:
       - db
     deploy:

docker/docker-entrypoint.sh

@@ -11,6 +11,9 @@ if [ ! -r /etc/lnt.cfg ]; then
 	  --tmp-dir /tmp/lnt \
 	  --db-dir "${DB_PATH}" \
 	  --default-db "${DB_BASE}"
+  if [ -n "${LNT_AUTH_TOKEN:-}" ]; then
+    sed -i "s/# \(api_auth_token =\).*/\1 '${LNT_AUTH_TOKEN}'/" /etc/lnt.cfg
+  fi
 fi
 
 cd /var/lib/lnt