Run CI tests twice daily

Author: ezimuel

.ci/jobs/elastic+elasticsearch-php+7.8.yml

@@ -11,4 +11,4 @@
           <commitId>, etc.)
     triggers:
     - github
-    - timed: '@daily'
+    - timed: 'H */12 * * *'

.ci/jobs/elastic+elasticsearch-php+7.9.yml

@@ -0,0 +1,14 @@
+---
+- job:
+    name: elastic+elasticsearch-php+7.9
+    display-name: 'elastic / elasticsearch-php # 7.9'
+    description: Testing the elasticsearch-php 7.9 branch.
+    parameters:
+    - string:
+        name: branch_specifier
+        default: refs/heads/7.9
+        description: the Git branch specifier to build (<branchName>, <tagName>,
+          <commitId>, etc.)
+    triggers:
+    - github
+    - timed: 'H */12 * * *'

.ci/jobs/elastic+elasticsearch-php+7.x.yml

@@ -11,4 +11,4 @@
           <commitId>, etc.)
     triggers:
     - github
-    - timed: '@daily'
+    - timed: 'H */12 * * *'

.ci/jobs/elastic+elasticsearch-php+master.yml

@@ -11,4 +11,4 @@
           <commitId>, etc.)
     triggers:
     - github
-    - timed: '@daily'
+    - timed: 'H */12 * * *'