Add github publish action

.github/workflows/publish.yml

@@ -0,0 +1,55 @@
+name: Publish Pyth SDK to crates.io
+
+on:
+  release:
+    types:
+      - created
+jobs:
+  publish-pyth-common-js:
+    name: Publish Pyth Common JS
+    if: ${{ startsWith(github.ref, "refs/tags/pyth-common-js:v") }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: "12.x"
+          registry-url: "https://registry.npmjs.org"
+      - run: npm ci
+        working-directory: "pyth-common-js"
+      - run: npm publish --access public
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+        working-directory: "pyth-common-js"
+  publish-pyth-evm-js:
+    name: Publish Pyth EVM JS
+    if: ${{ startsWith(github.ref, "refs/tags/pyth-evm-js:v") }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: "12.x"
+          registry-url: "https://registry.npmjs.org"
+      - run: npm ci
+        working-directory: "pyth-evm-js"
+      - run: npm publish --access public
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+        working-directory: "pyth-evm-js"
+  publish-pyth-terra-js:
+    name: Publish Pyth Common JS
+    if: ${{ startsWith(github.ref, "refs/tags/pyth-terra-js:v") }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: "12.x"
+          registry-url: "https://registry.npmjs.org"
+      - run: npm ci
+        working-directory: "pyth-terra-js"
+      - run: npm publish --access public
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+        working-directory: "pyth-terra-js"

README.md

@@ -14,3 +14,10 @@ Please see the [pyth.network documentation](https://docs.pyth.network/) for more
 ### pre-commit hooks
 
 We require the [pre-commit hooks](https://pre-commit.com/) defined in [`.pre-commit-config.yaml`](.pre-commit-config.yaml) to be ran on each PR before merging. To enable these to check and fix issues automatically in your local environment, install [pre-commit](https://pre-commit.com/) and run `pre-commit install` from the root of this repo.
+
+## Releases
+
+We use [Semantic Versioning](https://semver.org/) for our releases. In order to release a new version of any of the packages and publish it to npm, follow these steps:
+
+1. Run `npm version <new version number> --no-git-tag-version`. This command will update the version of the package. Then push your changes to github.
+2. Once your change is merged into `main`, create a release with tag `<package>:v<new version number>` like `pyth-evm-js:v1.5.2`, and a github action will automatically publish the new version of this package to npm.

pyth-common-js/package.json

@@ -21,8 +21,7 @@
     "prepare": "npm run build",
     "prepublishOnly": "npm test && npm run lint",
     "preversion": "npm run lint",
-    "version": "npm run format && git add -A src",
-    "postversion": "git push && git push --tags"
+    "version": "npm run format && git add -A src"
   },
   "keywords": [
     "pyth",

pyth-evm-js/package.json

@@ -22,8 +22,7 @@
     "prepare": "npm run build",
     "prepublishOnly": "npm test && npm run lint",
     "preversion": "npm run lint",
-    "version": "npm run format && git add -A src",
-    "postversion": "git push && git push --tags"
+    "version": "npm run format && git add -A src"
   },
   "keywords": [
     "pyth",

pyth-terra-js/package.json

@@ -22,8 +22,7 @@
     "prepare": "npm run build",
     "prepublishOnly": "npm test && npm run lint",
     "preversion": "npm run lint",
-    "version": "npm run format && git add -A src",
-    "postversion": "git push && git push --tags"
+    "version": "npm run format && git add -A src"
   },
   "keywords": [
     "pyth",