[cosmwasm] Release Contract (#726)

* build contract

* uploading artifacts

* test

* test

* different version for upload artifact

* update artifacts path

* add release code

* test

* update artifact path

* test

* update release names

* remove ls

* rename tag

* rename

Author: Dev Kalra

.github/workflows/release-pyth-cosmwasm-contract.yml

@@ -0,0 +1,45 @@
+name: Release Pyth Cosmwasm Contract
+
+on:
+  push:
+    tags:
+      - pyth-cosmwasm-contract-v*
+
+jobs:
+  release-contract:
+    name: Build and Release cosmwasm contract
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: target_chains/cosmwasm
+    steps:
+      - uses: actions/checkout@v2
+      - name: Build
+        run: |
+          bash ./build.sh
+          zip -r artifacts.zip artifacts
+      - name: Set env
+        run: |
+          PREFIX="refs/tags/pyth-cosmwasm-contract-"
+          echo "VERSION=${GITHUB_REF:${#PREFIX}}" >> $GITHUB_ENV
+      - name: Create Release
+        id: create_release
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ github.ref_name }}
+          # Setting VERSION in set env step and hence it will be available
+          release_name: Pyth Cosmwasm Contract ${{ env.VERSION }}
+          draft: false
+          prerelease: false
+      - name: Upload Release Asset
+        id: upload-release-asset
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }} # This pulls from the CREATE RELEASE step above, referencing it's ID to get its outputs object, which include a `upload_url`. See this blog post for more info: https://jasonet.co/posts/new-features-of-github-actions/#passing-data-to-future-steps
+          asset_path: target_chains/cosmwasm/artifacts.zip
+          asset_name: artifacts.zip
+          asset_content_type: application/zip