Add 3.12 stable

theforeman.org/yaml/jobs/test_3_12_stable.yaml

@@ -0,0 +1,31 @@
+- job:
+    name: test_3_12_stable
+    project-type: matrix
+    quiet-period: 2700
+    properties:
+      - github_foreman
+    scm:
+      - foreman:
+          branch: '3.12-stable'
+    triggers:
+      - scm_fifteen_minutes
+      - github
+    axes:
+      - axis:
+          type: user-defined
+          name: ruby
+          values:
+            - '2.7.6'
+      - axis:
+          type: label-expression
+          name: slave
+          values:
+            - fast
+    builders:
+      - test_develop
+    publishers:
+      - archive:
+          artifacts: 'pkg/*,Gemfile.lock,package-lock.json'
+          only-if-success: false
+      - junit:
+          results: 'jenkins/reports/unit/*.xml'