feat: keyword to prevent variables substitution

README.md

@@ -300,6 +300,23 @@ In order to be able to implement some **genericity** in your scripts and templat
     * any [GitLab CI variable](https://docs.gitlab.com/ee/ci/variables/#predefined-environment-variables)
       (ex: `${CI_ENVIRONMENT_URL}` to retrieve the actual environment exposed route)
 
+You can prevent any line from being processed by appending `# nosubst` at the end of the line. For instance in the following example, `${REMOTE_SERVICE_NAME}` won't be replaced by its environment value during GitLab job execution:
+
+```yaml
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  labels:
+    app: ${APPLICATION_NAME}
+  name: ${APPLICATION_NAME}
+data:
+  application.yml: |
+    remote:
+      some-service:
+          name: '${REMOTE_SERVICE_NAME}' # nosubst
+```
+
+
 > :warning:
 >
 > In order to be properly replaced, variables in your YAML descriptors shall be written with curly braces (ex: `${MYVAR}` and not `$MYVAR`).

templates/gitlab-ci-k8s.yml

@@ -236,7 +236,7 @@ stages:
   }
 
   function awkenvsubst() {
-    awk '{while(match($0,"[$]{[^}]*}")) {var=substr($0,RSTART+2,RLENGTH -3);val=ENVIRON[var];gsub(/["\\]/,"\\\\&", val);gsub("\n", "\\n", val);gsub("\r", "\\r", val);gsub("[$]{"var"}",val)}}1'
+    awk '!/# *nosubst/{while(match($0,"[$]{[^}]*}")) {var=substr($0,RSTART+2,RLENGTH -3);val=ENVIRON[var];gsub(/["\\]/,"\\\\&", val);gsub("\n", "\\n", val);gsub("\r", "\\r", val);gsub("[$]{"var"}",val)}}1'
   }
 
   function exec_hook() {