Add a conditional check to Travis for NGINX Plus builds (#334)

.travis.yml

@@ -25,12 +25,15 @@ jobs:
       env:
         scenario: module_centos
     - name: (Debian/Ubuntu) Install NGINX Plus
+      if: not (type = "pull_request" and fork = "true")
       env:
         scenario: plus
     - name: (Alpine Linux) Install NGINX Plus
+      if: not (type = "pull_request" and fork = "true")
       env:
         scenario: plus_alpine
     - name: (CentOS) Install NGINX Plus
+      if: not (type = "pull_request" and fork = "true")
       env:
         scenario: plus_centos
     - name: (Debian/Ubuntu) Install stable branch and push a config

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## 0.17.3 (Unreleased)
+
+BUG FIXES:
+
+*   Prevent TravisCI from trying to build (and failing) NGINX Plus images on external PRs.
+
 ## 0.17.2 (September 24, 2020)
 
 BUG FIXES: