Add GitHub Actions workflows for CI and CPAN release

CI workflow:
- Runs tests on push/PR across Perl 5.14 through 5.40
- Validates compatibility with the minimum supported version

Release workflow:
- Triggers on GitHub release publication
- Builds distribution tarball and uploads to CPAN
- Requires CPAN_USERNAME and CPAN_PASSWORD repository secrets

https://claude.ai/code/session_018RtsaLPCF2azHAQ1a6W7vk

Author: claude

.github/workflows/ci.yml

@@ -0,0 +1,30 @@
+name: CI
+
+on:
+  push:
+    branches: ['*']
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        perl-version: ['5.14', '5.20', '5.26', '5.32', '5.38', '5.40']
+
+    name: Perl ${{ matrix.perl-version }}
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: shogo82148/actions-setup-perl@v1
+        with:
+          perl-version: ${{ matrix.perl-version }}
+
+      - name: Build
+        run: |
+          perl Makefile.PL
+          make
+
+      - name: Test
+        run: make test

.github/workflows/release.yml

@@ -0,0 +1,32 @@
+name: Release to CPAN
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: shogo82148/actions-setup-perl@v1
+        with:
+          perl-version: '5.38'
+          install-modules-with: cpanm
+          install-modules: CPAN::Uploader
+
+      - name: Build and test
+        run: |
+          perl Makefile.PL
+          make
+          make test
+
+      - name: Build distribution
+        run: make dist
+
+      - name: Upload to CPAN
+        env:
+          CPAN_USERNAME: ${{ secrets.CPAN_USERNAME }}
+          CPAN_PASSWORD: ${{ secrets.CPAN_PASSWORD }}
+        run: cpan-upload -u "$CPAN_USERNAME" -p "$CPAN_PASSWORD" Net-IPData-*.tar.gz