docs: Add GitHub Actions setup guide for Datadog Synthetics

.github/ACTIONS_SETUP.md

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+# GitHub Actions Setup Guide
+
+## Datadog Synthetics Integration
+
+The repository includes a GitHub Actions workflow for running Datadog Synthetic tests on every push to `main` and on pull requests.
+
+### Required GitHub Secrets
+
+You need to add the following secrets to your GitHub repository:
+
+#### 1. DD_API_KEY
+- **Purpose**: Authenticates with Datadog API
+- **How to get it**:
+  1. Log into your Datadog account
+  2. Go to **Organization Settings** → **API Keys**
+  3. Create a new API key or copy an existing one
+  4. Name it something like "GitHub Actions CI"
+
+#### 2. DD_APP_KEY
+- **Purpose**: Provides application-level access to Datadog
+- **How to get it**:
+  1. Log into your Datadog account
+  2. Go to **Organization Settings** → **Application Keys**
+  3. Create a new application key
+  4. Name it "GitHub Actions Synthetics"
+
+### Adding Secrets to GitHub
+
+1. Go to your repository on GitHub: `https://github.com/jumpstartscaling/net`
+2. Click **Settings** (top right)
+3. In the left sidebar, click **Secrets and variables** → **Actions**
+4. Click **New repository secret**
+5. Add each secret:
+   - Name: `DD_API_KEY`
+   - Value: [paste your Datadog API key]
+   - Click **Add secret**
+6. Repeat for `DD_APP_KEY`
+
+### Workflow File Location
+
+The workflow is configured in:
+```
+.github/workflows/datadog-synthetics.yml
+```
+
+### What It Does
+
+- Runs on every push to `main` branch
+- Runs on every pull request to `main` branch
+- Executes Datadog Synthetic tests tagged with `tag:e2e-tests`
+- Fails the build if tests fail
+- Reports test results in the GitHub Actions UI
+
+### Configuring Which Tests to Run
+
+The workflow currently runs tests with the tag `e2e-tests`. To change this:
+
+1. Edit `.github/workflows/datadog-synthetics.yml`
+2. Modify line 36: `test_search_query: 'tag:e2e-tests'`
+3. Change to your preferred tag or search query
+
+Examples:
+- Run all tests: `test_search_query: '*'`
+- Run specific tag: `test_search_query: 'tag:production'`
+- Run by name: `test_search_query: 'name:Homepage Test'`
+
+### Disabling the Workflow
+
+If you don't want to use Datadog Synthetics, you can:
+1. Delete the workflow file: `.github/workflows/datadog-synthetics.yml`
+2. Or rename it to `.github/workflows/datadog-synthetics.yml.disabled`
+
+### Troubleshooting
+
+**Error: "Input required and not supplied: api_key"**
+- Solution: Make sure you've added the `DD_API_KEY` secret to GitHub
+
+**Error: "Invalid API key"**
+- Solution: Verify your API key is correct in Datadog and GitHub secrets
+
+**Tests not running**
+- Check that you have Synthetic tests configured in your Datadog account
+- Verify the tests are tagged with `e2e-tests` (or update the search query)
+- Ensure the tests are active and not paused
+
+**No tests found**
+- Update the `test_search_query` in the workflow file to match your test tags
+- Or remove the `test_search_query` line to run all tests