chore: release automation (#320)

Add semantic-release to this repo. Pre release versions should be installed
using pip's native support for installing from a branch, e.g.
pip install git+https://github.com/Paperspace/gradient-cli.git@chore-release-automation

.circleci/config.yml

@@ -1,19 +1,43 @@
 version: 2.1
+
+orbs:
+  release-tools: paperspace/release-tools@0.1.0
+
 workflows:
-  build_and_deploy:
+  master:
     jobs:
       - test:
           filters:
+            branches:
+              only: master
             tags:
               only: /.*/
-      - deploy:
+      - release-tools/release:
+          name: create release
+          context: semantic-release
+          workspace: .
           requires:
             - test
+          filters:
+            branches:
+              only: master
+
+  pr:
+    jobs:
+      - test:
+          filters:
+            branches:
+              ignore: master
+
+  release:
+    jobs:
+      - deploy:
           filters:
             tags:
               only: /.*/
             branches:
               ignore: /.*/
+
 executors:
   python-tox:
     docker:
@@ -29,12 +53,21 @@ jobs:
       - run:
           name: Run tests
           command: make run-tests
+      - persist_to_workspace:
+          root: .
+          paths:
+            - "."
 
   deploy:
     docker:
       - image: circleci/python:3.6
     steps:
       - checkout
+      - run:
+          name: Make version.py
+          command: |
+            echo "Publishing version $CIRCLE_TAG"
+            echo "version = \"${CIRCLE_TAG}\"" > gradient/version.py
       - run:
           name: import GPG key
           command: |
@@ -45,7 +78,7 @@ jobs:
           command: |
             make pip-install-dev
       - run:
-          name: verify git tag vs. version
+          name: verify version is valid
           command: |
             python setup.py verify
       - run:

gradient/version.py

@@ -1 +1 @@
-version = "0.9.1a5"
+version = "0.0.0"

setup.py

@@ -27,13 +27,8 @@ class VerifyVersionCommand(install):
     description = 'verify that the git tag matches our version'
 
     def run(self):
-        tag = os.getenv('CIRCLE_TAG')
-
-        if tag != version:
-            info = "Git tag: {0} does not match the version of this app: {1}".format(
-                tag, version
-            )
-            sys.exit(info)
+        if '0.0.0' == version:
+            sys.exit("Version unspecified")
 
 
 setup(