[chore] track markdown-link-check with renovate (open-telemetry#36552)

<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
#### Description
This PR adds markdown-link-check to the tracked dependencies of
renovate. It achieves that by using the
[`customManagers:githubActionsVersions`](https://docs.renovatebot.com/presets-customManagers/#custommanagersgithubactionsversions)
renovate preset that enables user to update arbitrary versions in github
actions files without having to maintain their own regex for them.

<!-- Issue number (e.g. open-telemetry#1234) or full URL to issue, if applicable. -->
#### Link to tracking issue
Fixes open-telemetry#36259

<!--Describe what testing was performed and which tests were added.-->
#### Testing
This setup is already in use in the dynatrace collector distro and works
great: [latest update
PR](Dynatrace/dynatrace-otel-collector#382),
[renovate
config](https://github.com/Dynatrace/dynatrace-otel-collector/blob/07e4662f92b0cadfb311eca74c9269c1c1598634/renovate.json#L6)

---------

Signed-off-by: Moritz Wiesinger <[email protected]>

.github/workflows/changelog.yml

@@ -15,6 +15,8 @@ env:
   # Make sure to exit early if cache segment download times out after 2 minutes.
   # We limit cache download as a whole to 5 minutes.
   SEGMENT_DOWNLOAD_TIMEOUT_MINS: 2
+  # renovate: datasource=github-releases depName=tcort/markdown-link-check
+  MD_LINK_CHECK_VERSION: "3.12.2"
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref }}
@@ -84,7 +86,7 @@ jobs:
         run: make chlog-preview > changelog_preview.md
       - name: Install markdown-link-check
         if: ${{ !contains(github.event.pull_request.labels.*.name, 'dependencies') && !contains(github.event.pull_request.labels.*.name, 'Skip Changelog') && !contains(github.event.pull_request.title, '[chore]')}}
-        run: npm install -g markdown-link-check@3.12.2
+        run: npm install -g markdown-link-check@${{ env.MD_LINK_CHECK_VERSION }}
       - name: Run markdown-link-check
         if: ${{ !contains(github.event.pull_request.labels.*.name, 'dependencies') && !contains(github.event.pull_request.labels.*.name, 'Skip Changelog') && !contains(github.event.pull_request.title, '[chore]')}}
         run: |

.github/workflows/check-links.yaml

@@ -9,6 +9,10 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
   cancel-in-progress: true
 
+env:
+  # renovate: datasource=github-releases depName=tcort/markdown-link-check
+  MD_LINK_CHECK_VERSION: "3.12.2"
+
 jobs:
   changedfiles:
     name: changed files
@@ -36,7 +40,7 @@ jobs:
           fetch-depth: 0
 
       - name: Install markdown-link-check
-        run: npm install -g markdown-link-check@3.12.2
+        run: npm install -g markdown-link-check@${{ env.MD_LINK_CHECK_VERSION }}
 
       - name: Run markdown-link-check
         run: |

renovate.json

@@ -8,7 +8,10 @@
       "go": "1.22.0"
     },
     "schedule": ["every tuesday"],
-    "extends": ["config:recommended"],
+    "extends": [
+      "config:recommended",
+      "customManagers:githubActionsVersions"
+    ],
     "ignorePaths": [
       "**/receiver/apachesparkreceiver/testdata/integration/Dockerfile.apache-spark",
       "**/receiver/elasticsearchreceiver/testdata/integration/Dockerfile.elasticsearch.7_16_3",