Add complete link to PR template so gh action doesn't fail

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,7 +1,7 @@
 ### All Submissions:
 
 * [ ] Have you followed the guidelines in our [Contributing document](CONTRIBUTING.md)?
-* [ ] Have you checked to ensure there aren't other open [Pull Requests](../../../pulls) for the same update/change?
+* [ ] Have you checked to ensure there aren't other open [Pull Requests](https://github.com/microbiomedata/nmdc_notebooks/pulls) for the same update/change?
 * [ ] Does your PR link to an issue?
 * [ ] Have you described the changes this PR will make?
 

.github/workflows/link_check_push.yml

@@ -1,16 +1,18 @@
-# This workflow will check all the links in the markdown files in the repository whenever a push event occurs.
+# This workflow will check all the links in the markdown files in the repository on each PR or by manual trigger.
 
-name: Check links on push
-on: [ push ]
+name: Check links on pull request
+on:
+  pull_request:
+  workflow_dispatch:
 jobs:
   linkChecker:
-      runs-on: ubuntu-latest
-      steps:
-        - uses: actions/checkout@v4
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
 
-        - name: Link Checker
-          # Reference: https://github.com/lycheeverse/lychee-action
-          id: lychee
-          uses: lycheeverse/lychee-action@v1
-          with:
-            fail: true
+      - name: Link Checker
+        # Reference: https://github.com/lycheeverse/lychee-action
+        id: lychee
+        uses: lycheeverse/lychee-action@v1
+        with:
+          fail: true