feat: allow interactive docker testing with 'command' env var

Piping to the 'bash' command does not allow for interacting with the Docker container when running the 'test-docker' make target. By moving it to its own line, the interaction is now allowed. Example: `command=bash make test-docker`

Author: Sam Harrison

.gitignore

@@ -326,4 +326,4 @@ $RECYCLE.BIN/
 /.vscode
 
 .env
-prism
+prism*

Makefile

@@ -16,7 +16,8 @@ test:
 test-integ: test
 
 test-docker:
-	curl -s https://raw.githubusercontent.com/sendgrid/sendgrid-oai/master/prism/prism.sh | bash
+	curl -s https://raw.githubusercontent.com/sendgrid/sendgrid-oai/master/prism/prism.sh -o prism.sh
+	bash ./prism.sh
 
 release:
 	dotnet pack -c Release