#2158: Add missing env variable and fix dockerfile name

Author: thearusable

.github/workflows/build-docs.yml

@@ -17,6 +17,7 @@ jobs:
       UBUNTU: 18.04
       COMPILER_TYPE: gnu
       COMPILER: gcc-8
+      HOST_COMPILER: gcc-8
       BUILD_TYPE: release
       ULIMIT_CORE: 0
       VT_LB: 1

docker-compose.yml

@@ -330,7 +330,7 @@ services:
     build:
       context: .
       target: base
-      dockerfile: ci/docker/ubuntu-${UBUNTU}-${COMPILER_TYPE}-docs.dockerfile
+      dockerfile: ci/docker/ubuntu-${COMPILER_TYPE}-docs.dockerfile
       args:
         <<: *default-args
         token: ${TOKEN}