feat: support multiple email recipients in --to option

Accept comma-separated addresses and read EMAIL_TO from a repo variable
instead of a secret.

Author: belambert

.github/workflows/check.yml

@@ -29,7 +29,7 @@ jobs:
           EBIRD_API_KEY: ${{ secrets.EBIRD_API_KEY }}
           RESEND_API_KEY: ${{ secrets.RESEND_API_KEY }}
           RESEND_FROM: alerts@resend.dev
-        run: uv run snowy check --to "${{ secrets.EMAIL_TO }}"
+        run: uv run snowy check --to "${{ vars.EMAIL_TO }}"
 
       - name: Delete old state cache
         env:

src/snowy_sightings/cli.py

@@ -65,7 +65,7 @@ def sightings(
 
 @app.command()
 def check(
-    to: str = typer.Option(..., help="Recipient email address"),
+    to: str = typer.Option(..., help="Recipient email address(es), comma-separated"),
     state_file: Path = typer.Option(
         ".snowy-state.json", help="Path to state JSON file"
     ),
@@ -103,7 +103,8 @@ def check(
         f"<table><tr><th>Date</th><th>Count</th><th>Location</th><th>Link</th></tr>"
         f"{rows}</table>"
     )
-    send_email(to, f"🦉 {len(new)} new snowy owl sighting(s)", html)
+    recipients = [addr.strip() for addr in to.split(",")]
+    send_email(recipients, f"🦉 {len(new)} new snowy owl sighting(s)", html)
     typer.echo("Email sent.")
 
 

src/snowy_sightings/notify.py

@@ -5,7 +5,7 @@
 import resend
 
 
-def send_email(to: str, subject: str, body_html: str) -> dict:
+def send_email(to: list[str], subject: str, body_html: str) -> dict:
     """Send an email via Resend."""
     resend.api_key = os.environ["RESEND_API_KEY"]
     from_addr = os.environ.get("RESEND_FROM", "alerts@resend.dev")