Move test matrix configuration to global variable

Until now, the test matrix has been defined in a local variable for the
`.github/workflows/test.yaml` template. In preparation for generating
Renovate `postUpgradeTasks` and a list of test instances in a make
variable, we need to be able to access the matrix test configuration in
other templates.

This commit moves the test matrix configuration to global variable
`testMatrix`. For now, the GitHub actions template will continue to read
the test matrix from the file-level variable `matrix`, but will fall
back to the global variable `testMatrix` if the file-level variable is
missing.

All already onboarded components should migrate their test matrix (if
any) to global parameter `testMatrix`.

config_defaults.yml

@@ -3,6 +3,11 @@
   feature_goUnitTests: false
   feature_goldenTests: false
   componentName: ""
+  testMatrix: {}
+  # key: provider
+  # entries:
+  #   - variant1
+  #   - variant2
 
 .github/ISSUE_TEMPLATE/config.yml:
   contact_links:
@@ -13,11 +18,7 @@
 .github/workflows/test.yaml:
   makeTarget: test
   goldenTest_makeTarget: golden-diff # Requires `feature_goldenTests`
-  matrix: {}
-  # key: provider
-  # entries:
-  #   - variant1
-  #   - variant2
+  #matrix: {} # deprecated, use global param `testMatrix`
 
 docs/antora.yml:
   version: master

moduleroot/.github/workflows/test.yaml.erb

@@ -1,3 +1,6 @@
+<%-
+@matrix = @configs.key?('matrix') ? @configs['matrix'] : @configs['testMatrix']
+-%>
 name: Pull Request
 on:
   pull_request:
@@ -30,11 +33,11 @@ jobs:
 <%- if @configs['feature_componentCompile'] -%>
   test:
     runs-on: ubuntu-latest
-  <%- if !@configs['matrix'].empty? -%>
+  <%- if [email protected]? -%>
     strategy:
       matrix:
-        <%= @configs['matrix']['key'] -%>:
-<% @configs['matrix']['entries'].each do |entry| -%>
+        <%= @matrix['key'] -%>:
+<% @matrix['entries'].each do |entry| -%>
           - <%= entry %>
 <% end -%>
   <%- end -%>
@@ -64,11 +67,11 @@ jobs:
 <%- if @configs['feature_goldenTests'] -%>
   golden:
     runs-on: ubuntu-latest
-  <%- if !@configs['matrix'].empty? -%>
+  <%- if !@matrix.empty? -%>
     strategy:
       matrix:
-        <%= @configs['matrix']['key'] -%>:
-<% @configs['matrix']['entries'].each do |entry| -%>
+        <%= @matrix['key'] -%>:
+<% @matrix['entries'].each do |entry| -%>
           - <%= entry %>
 <% end -%>
   <%- end -%>