Pin github actions and docker images (open-telemetry#1691)

Author: trask

.github/renovate.json5

@@ -1,9 +1,18 @@
 {
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
   "extends": [
-    "config:base"
+    "config:recommended",
+    "docker:pinDigests",
+    "helpers:pinGitHubActionDigests"
   ],
   "packageRules": [
+    {
+      // this is to reduce the number of renovate PRs by consolidating them into a weekly batch
+      "matchManagers": ["github-actions"],
+      "extends": ["schedule:weekly"],
+      "groupName": "github actions",
+      "separateMinorPatch": false // overrides separateMinorPatch specified above
+    },
     {
       "matchPackageNames": [
         "io.opentelemetry:**",
@@ -16,14 +25,6 @@
       // of that release instead of the unstable version for a future release
       "ignoreUnstable": false
     },
-    {
-      "matchPackagePrefixes": ["ch.qos.logback:"],
-      "groupName": "logback packages"
-    },
-    {
-      "matchPackagePrefixes": ["io.micrometer:"],
-      "groupName": "micrometer packages"
-    },
     {
       // prevent 3.0.1u2 -> 3.0.1
       "matchPackageNames": ["com.google.code.findbugs:annotations"],