Add bdd stuff

backend/bdd/features/environment.py

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+from behave.runner import Context
+
+
+def before_all(context: Context):
+    context.vars = {}

backend/bdd/features/pki/nonce/pki-acme.feature

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+Feature: Nonce
+  Scenario: Generate a new nonce
+    Given I have a PKI project as "pki_project"
+     When I send a HEAD request to "/v1/pki/acme/profiles/{pki_project.id}/new-nonce"
+     Then the response header "Replay-Nonce" should contains non-empty value

backend/bdd/features/steps/pki_acme.py

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+from behave.runner import Context
+
+import httpx
+from behave import given
+from behave import when
+from behave import then
+
+
+BASE_URL = "http://localhost:8080"
+
+
+class PkiProject:
+    def __init__(self, id: str):
+        self.id = id
+
+
+@given('I have a PKI project as "{project_var}"')
+def step_impl(context: Context, project_var: str):
+    # TODO: Fixed value for now, just to make test much easier,
+    #       we should call infisical API to create such project instead
+    #       in the future
+    project_id = "c051e74c-48a7-4724-832c-d5b496698546"
+    context.vars[project_var] = PkiProject(project_id)
+
+
+@when('I send a {method} request to "{url}"')
+def step_impl(context: Context, method: str, url: str):
+    with httpx.Client(base_url=BASE_URL) as client:
+        context.response = client.request(method, url.format(**context.vars))
+
+
+@then('the response header "{header}" should contains non-empty value')
+def step_impl(context: Context, header: str):
+    header_value = context.response.headers.get(header)
+    assert header_value