Move HTTPS test to a bash script

See https://github.com/simonw/datasette/issues/1955#issuecomment-1356627931

tests/test_datasette_https_server.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+# Generate certificates
+python -m trustme
+# This creates server.pem, server.key, client.pem
+
+# Start the server in the background
+datasette --memory \
+    --ssl-keyfile=server.key \
+    --ssl-certfile=server.pem \
+    -p 8152 &
+
+# Store the background process ID in a variable
+server_pid=$!
+
+# Wait for the server to start
+sleep 2
+
+# Make a test request using curl
+curl -f --cacert client.pem 'https://localhost:8152/_memory.json'
+
+# Save curl's exit code (-f option causes it to return one on HTTP errors)
+curl_exit_code=$?
+
+# Shut down the server
+kill $server_pid
+sleep 1
+
+# Clean up the certificates
+rm server.pem server.key client.pem
+
+echo $curl_exit_code
+exit $curl_exit_code