CI: initial cirrus config

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+# The guide to programming cirrus-ci tasks using starlark is found at
+# https://cirrus-ci.org/guide/programming-tasks/
+#
+# In this simple starlark script we simply check conditions for whether
+# a CI run should go ahead. If the conditions are met, then we just
+# return the yaml containing the tasks to be run.
+
+load("cirrus", "env", "fs", "http")
+
+def main(ctx):
+    ######################################################################
+    # Should wheels be built?
+    # Only test on the numpy/numpy repository
+    ######################################################################
+
+    if env.get("CIRRUS_REPO_FULL_NAME") != "andyfaff/numpy":
+        return []
+
+    # if env.get("CIRRUS_CRON", "") == "nightly":
+    #     return fs.read("ci/cirrus_wheels.yml")
+
+    # Obtain commit message for the event. Unfortunately CIRRUS_CHANGE_MESSAGE
+    # only contains the actual commit message on a non-PR trigger event.
+    # For a PR event it contains the PR title and description.
+    SHA = env.get("CIRRUS_CHANGE_IN_REPO")
+    url = "https://api.github.com/repos/scipy/scipy/git/commits/" + SHA
+    dct = http.get(url).json()
+    # if "[wheel build]" in dct["message"]:
+    #     return fs.read("ci/cirrus_wheels.yml")
+
+    if "[skip cirrus]" in dct["message"] or "[skip ci]" in dct["message"]:
+        return []
+
+    config =  fs.read("tools/ci/cirrus_general.yml")
+
+    # add extra jobs to the cirrus run by += adding to config
+
+    return config