CI: Run linting checks on PRs as they use hosted runners and remove old redundant PR signature comment workflow.

Author: brycelelbach

.github/workflows/pr-signature-comment.yml

@@ -4,8 +4,8 @@ on:
   push:
     branches:
       - '**'
-  # pull_request is not supported for this workflow due to self-hosted runners
-  # see the "Reviewing PRs from forks" section in CONTRIBUTING.md for more details
+  pull_request_target:
+    types: [opened, reopened, synchronize]
 
 jobs:
   test-git-lfs:
@@ -14,6 +14,8 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.head.sha || github.sha }}
 
       - name: Check that binary files are tracked by LFS
         id: git-lfs-check

.github/workflows/test-git-lfs.yml

@@ -4,8 +4,8 @@ on:
   push:
     branches:
       - '**'
-  # pull_request is not supported for this workflow due to self-hosted runners
-  # see the "Reviewing PRs from forks" section in CONTRIBUTING.md for more details
+  pull_request_target:
+    types: [opened, reopened, synchronize]
 
 jobs:
   test-git-signatures:
@@ -16,6 +16,7 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 0  # Need full history to compare with main
+          ref: ${{ github.event.pull_request.head.sha || github.sha }}
 
       - name: Check commit signatures
         id: github-api-signature-check

.github/workflows/test-git-signatures.yml

@@ -4,8 +4,8 @@ on:
   push:
     branches:
       - '**'
-  # pull_request is not supported for this workflow due to self-hosted runners
-  # see the "Reviewing PRs from forks" section in CONTRIBUTING.md for more details
+  pull_request_target:
+    types: [opened, reopened, synchronize]
 
 jobs:
   test-links:
@@ -14,6 +14,8 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.head.sha || github.sha }}
 
       - name: Set up Python
         uses: actions/setup-python@v5

.github/workflows/test-links.yml

@@ -4,8 +4,8 @@ on:
   push:
     branches:
       - '**'
-  # pull_request is not supported for this workflow due to self-hosted runners
-  # see the "Reviewing PRs from forks" section in CONTRIBUTING.md for more details
+  pull_request_target:
+    types: [opened, reopened, synchronize]
 
 jobs:
   test-yaml:
@@ -14,6 +14,8 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.head.sha || github.sha }}
 
       - name: Set up Python
         uses: actions/setup-python@v5