fix: repair broken call-to-action link on Volunteer page (#2983)

apps/pages/migrations/0005_fix_volunteer_page_cta.py

@@ -0,0 +1,45 @@
+from django.db import migrations
+
+
+def fix_volunteer_cta(apps, schema_editor):
+    Page = apps.get_model("pages", "Page")
+    try:
+        page = Page.objects.get(path="psf/volunteer")
+    except Page.DoesNotExist:
+        return
+
+    content = page.content
+    if "psf-volunteers" not in content:
+        return
+
+    # Remove the broken CTA section about the psf-volunteers mailing list,
+    # which was archived during the Mailman 2.1 -> Mailman 3 migration in
+    # May 2025 and no longer exists.
+    lines = content.split("\n")
+    new_lines = []
+    drop = False
+    for line in lines:
+        if "psf-volunteers" in line:
+            drop = True
+        if not drop:
+            new_lines.append(line)
+        elif "Sign up" in line or "sign up" in line:
+            continue
+        elif line.strip() == "":
+            drop = False
+            new_lines.append(line)
+
+    new_content = "\n".join(new_lines).strip()
+    if new_content != content:
+        page.content = new_content
+        page.save()
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("pages", "0004_alter_page_creator_alter_page_last_modified_by"),
+    ]
+
+    operations = [
+        migrations.RunPython(fix_volunteer_cta, migrations.RunPython.noop),
+    ]