Add a test for pint ci with no changes

cmd/pint/tests/0188_ci_noop.txt

@@ -0,0 +1,69 @@
+http response bitbucket /rest/insights/1.0/projects/prometheus/repos/rules/commits/.*/reports/pint 200 OK
+http response bitbucket /rest/api/1.0/projects/prometheus/repos/rules/commits/.*/pull-requests 200 {}
+http start bitbucket 127.0.0.1:6188
+
+mkdir testrepo
+cd testrepo
+exec git init --initial-branch=main .
+
+cp ../src/rules.yml rules.yml
+cp ../src/.pint.hcl .
+env GIT_AUTHOR_NAME=pint
+env GIT_AUTHOR_EMAIL=pint@example.com
+env GIT_COMMITTER_NAME=pint
+env GIT_COMMITTER_EMAIL=pint@example.com
+exec git add .
+exec git commit -am 'import rules and config'
+
+exec git checkout -b v2
+exec touch .keep
+exec git add .keep
+exec git commit -am 'v2'
+
+env BITBUCKET_AUTH_TOKEN="12345"
+exec pint -l debug --no-color ci
+! stdout .
+stderr '{"value":2,"title":"Number of rules parsed","type":"NUMBER"}'
+stderr '{"value":2,"title":"Number of rules checked","type":"NUMBER"}'
+stderr '{"value":0,"title":"Number of problems found","type":"NUMBER"}'
+stderr '{"value":0,"title":"Number of offline checks","type":"NUMBER"}'
+stderr '{"value":0,"title":"Number of online checks","type":"NUMBER"}'
+stderr '{"value":0,"title":"Checks duration","type":"DURATION"}'
+
+-- src/rules.yml --
+- alert: alert1
+  expr: up == 0
+  for: 5m
+- alert: alert2
+  expr: up == 0
+  for: 5m
+
+-- src/.pint.hcl --
+parser {
+  relaxed = [".*"]
+}
+ci {
+  baseBranch = "main"
+}
+repository {
+  bitbucket {
+    uri        = "http://127.0.0.1:6188"
+    project    = "prometheus"
+    repository = "rules"
+  }
+}
+prometheus "prom" {
+  uri      = "http://127.0.0.1:2188"
+  timeout  = "5s"
+  required = true
+}
+rule {
+  match {
+    kind = "alerting"
+  }
+  alerts {
+    range      = "1d"
+    step       = "1m"
+    resolve    = "5m"
+  }
+}