Add workflows to test upload-artifact 500-file limit

.github/workflows/upload-artifact-test-single-upload.yml

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+# Workflow to test upload-artifact action with 501 files in a single upload
+# This tests the 500 file limit mentioned in https://github.com/actions/upload-artifact
+
+name: Upload Artifact Test - Single Upload
+
+# Controls when the action will run. Workflow runs when manually triggered using the UI or API.
+on:
+  workflow_dispatch:
+
+jobs:
+  test-single-upload:
+    name: Test uploading 501 files in a single upload-artifact step
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+
+    steps:
+      - name: Create 501 test files
+        run: |
+          mkdir -p test-files
+          for i in {1..501}; do
+            echo "This is test file number $i" > test-files/file-$i.txt
+          done
+          echo "Created $(ls test-files | wc -l) files"
+
+      - name: Upload all 501 files in a single step
+        uses: actions/upload-artifact@v4
+        with:
+          name: test-501-files-single-upload
+          path: test-files/

.github/workflows/upload-artifact-test-split-upload.yml

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+# Workflow to test upload-artifact action with 501 files split into 2 uploads
+# This tests the 500 file limit mentioned in https://github.com/actions/upload-artifact
+
+name: Upload Artifact Test - Split Upload
+
+# Controls when the action will run. Workflow runs when manually triggered using the UI or API.
+on:
+  workflow_dispatch:
+
+jobs:
+  test-split-upload:
+    name: Test uploading 501 files in two separate upload-artifact steps
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+
+    steps:
+      - name: Create 501 test files
+        run: |
+          mkdir -p test-files
+          for i in {1..501}; do
+            echo "This is test file number $i" > test-files/file-$i.txt
+          done
+          echo "Created $(ls test-files | wc -l) files"
+
+      - name: Create directories for split upload
+        run: |
+          mkdir -p test-files-part1 test-files-part2
+          for i in {1..250}; do
+            cp test-files/file-$i.txt test-files-part1/
+          done
+          for i in {251..501}; do
+            cp test-files/file-$i.txt test-files-part2/
+          done
+          echo "Part 1 has $(ls test-files-part1 | wc -l) files"
+          echo "Part 2 has $(ls test-files-part2 | wc -l) files"
+
+      - name: Upload files 1-250
+        uses: actions/upload-artifact@v4
+        with:
+          name: test-501-files-split-upload-part1
+          path: test-files-part1/
+
+      - name: Upload files 251-501
+        uses: actions/upload-artifact@v4
+        with:
+          name: test-501-files-split-upload-part2
+          path: test-files-part2/

.github/workflows/upload-artifact-test-zipped.yml

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+# Workflow to test upload-artifact action with 501 files zipped into a single file
+# This tests the 500 file limit mentioned in https://github.com/actions/upload-artifact
+
+name: Upload Artifact Test - Zipped Upload
+
+# Controls when the action will run. Workflow runs when manually triggered using the UI or API.
+on:
+  workflow_dispatch:
+
+jobs:
+  test-zipped-upload:
+    name: Test uploading 501 files as a single zip file
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+
+    steps:
+      - name: Create 501 test files
+        run: |
+          mkdir -p test-files
+          for i in {1..501}; do
+            echo "This is test file number $i" > test-files/file-$i.txt
+          done
+          echo "Created $(ls test-files | wc -l) files"
+
+      - name: Zip all files
+        run: |
+          zip -r test-files.zip test-files/
+          echo "Zip file created: $(ls -lh test-files.zip)"
+
+      - name: Upload zip file
+        uses: actions/upload-artifact@v4
+        with:
+          name: test-501-files-zipped
+          path: test-files.zip