Add plus secrets for image building in tests (#4020)

Author: ciarams87

.github/workflows/conformance.yml

@@ -133,6 +133,9 @@ jobs:
             NJS_DIR=internal/controller/nginx/modules/src
             NGINX_CONF_DIR=internal/controller/nginx/conf
             BUILD_AGENT=gha
+          secrets: |
+            ${{ contains(inputs.image, 'plus') && format('"nginx-repo.crt={0}"', secrets.NGINX_CRT) || '' }}
+            ${{ contains(inputs.image, 'plus') && format('"nginx-repo.key={0}"', secrets.NGINX_KEY) || '' }}
 
       - name: Update Go Modules
         if: ${{ github.event_name == 'schedule' }}

.github/workflows/functional.yml

@@ -117,6 +117,9 @@ jobs:
             NJS_DIR=internal/controller/nginx/modules/src
             NGINX_CONF_DIR=internal/controller/nginx/conf
             BUILD_AGENT=gha
+          secrets: |
+            ${{ contains(inputs.image, 'plus') && format('"nginx-repo.crt={0}"', secrets.NGINX_CRT) || '' }}
+            ${{ contains(inputs.image, 'plus') && format('"nginx-repo.key={0}"', secrets.NGINX_KEY) || '' }}
 
       - name: Setup license file for plus
         if: ${{ inputs.image == 'plus' }}