FEATURE: Support `{{config}}` replacement to template name in `env`.

FEATURE: Support {{config}} replacement to template name in env.

diff --git a/README.md b/README.md
index e8762b2..4fd4a63 100644
--- a/README.md
+++ b/README.md
@@ -108,6 +108,20 @@ links:
 Links another container to the current container. This will add `--link postgres:postgres`
 to the options when running the container.
 
+#### environment variables:
+
+Setting environment variables to the current container.
+
+`‍``
+# app.yml
+
+env:
+  DISCOURSE_DB_HOST: some-host
+  DISCOURSE_DB_NAME: {{config}}_discourse
+`‍``
+
+The above will add `-e DISCOURSE_DB_HOST=some-host -e DISCOURSE_DB_NAME=app_discourse` to the options when running the container.
+
 #### labels:
 `‍``
 # app.yml
diff --git a/launcher b/launcher
index 30245c8..d45b713 100755
--- a/launcher
+++ b/launcher
@@ -353,7 +353,7 @@ RUBY
       if [ "$i" == "*ERROR." ]; then
         ok=0
       elif [ -n "$i" ]; then
-        env[${#env[@]}]=$i
+        env[${#env[@]}]=$(echo $i | sed s/{{config}}/${config}/g)
       fi
     done <<< "$raw"

GitHub sha: faaa8c17

Fix bug introduced in faaa8c17ca08d22563ab0153b7f964d937f269bf.