Use circle contexts for github and packagecloud publishing

.circleci/config.yml

@@ -39,7 +39,7 @@ jobs:
           root: .
           paths: ['dist/*']
 
-  publish-linux:
+  publish-packagecloud:
     docker:
       - image: circleci/golang:1.10
     working_directory: /go/src/github.com/segmentio/aws-okta
@@ -56,10 +56,19 @@ jobs:
             # fixes https://askubuntu.com/questions/872399/error-failed-to-build-gem-native-extension-when-trying-to-download-rubocop
             sudo gem install rake
             sudo make -f Makefile.tools package_cloud
+
+  publish-github-linux:
+    docker:
+      - image: circleci/golang:1.10
+    working_directory: /go/src/github.com/segmentio/aws-okta
+    steps:
+      - checkout
+      - attach_workspace: { at: . }
       - run:
-          name: Release
+          name: Install tools
           command: |
-            make -f Makefile.release publish-linux
+            make -f Makefile.tools github-release
+            make -f Makefile.release publish-github-linux
 
 workflows:
   version: 2
@@ -74,7 +83,19 @@ workflows:
           filters:
             tags:
               only: /.*/
-      - publish-linux:
+      - publish-packagecloud:
+          context: packagecloud
+          requires:
+            - dist-linux
+          filters:
+            # never publish from a branch event
+            branches:
+              ignore: /.*/
+            # release only on tag push events like vX[.Y.Z...][-whatever]
+            tags:
+              only: /v[0-9]+(\.[0-9]+)*(-[a-zA-Z0-9-]+)?/
+      - publish-github-linux:
+          context: github-segmentcircle-oss-release
           requires:
             - dist-linux
           filters: