Add changesets cli and npm publication from CI

.changeset/README.md

@@ -0,0 +1,8 @@
+# Changesets
+
+Hello and welcome! This folder has been automatically generated by `@changesets/cli`, a build tool that works
+with multi-package repos, or single-package repos to help you version and publish your code. You can
+find the full documentation for it [in our repository](https://github.com/changesets/changesets)
+
+We have a quick list of common questions to get you started engaging with this project in
+[our documentation](https://github.com/changesets/changesets/blob/main/docs/common-questions.md)

.changeset/config.json

@@ -0,0 +1,11 @@
+{
+  "$schema": "https://unpkg.com/@changesets/config@3.1.1/schema.json",
+  "changelog": "@changesets/cli/changelog",
+  "commit": false,
+  "fixed": [],
+  "linked": [],
+  "access": "public",
+  "baseBranch": "main",
+  "updateInternalDependencies": "patch",
+  "ignore": []
+}

.github/workflows/publish.yml

@@ -0,0 +1,46 @@
+name: Publish
+on:
+  push:
+    branches:
+      - main
+
+env:
+  CI: true
+jobs:
+  Version:
+    # prevents this action from running on forks
+    if: github.repository == 'imgproxy/imgproxy-node'
+    permissions:
+      contents: write # to create release (changesets/action)
+      pull-requests: write # to create pull request (changesets/action)
+      id-token: write #  OpenID Connect token needed for provenance
+    timeout-minutes: 5
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 18
+          cache: "npm"
+
+      - name: "Npm install"
+        run: npm ci
+
+      - name: Build
+        run: npm run build
+
+      - name: Create Release Pull Request or Publish to npm
+        uses: changesets/action@v1
+        with:
+          version: npx @changesets/cli version
+          publish: npx @changesets/cli publish
+          commit: "Changesets versioning & publication"
+          title: "Changesets: Versioning & Publication"
+          createGithubReleases: true
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}

README.md

@@ -115,3 +115,14 @@ It takes the following arguments:
 - `key` (`string | undefined`) - (optional) hex-encoded key used to encode the URL. It must be a hex-encoded 16-byte string. This option overrides IMGPROXY_KEY from process.env for one request.
 - `encryptKey` (`string | undefined`) - (optional, **PRO feature**) hex-encoded key used to encrypt the URL. The key should be either 16, 24, or 32 bytes long for AES-128-CBC, AES-192-CBC, or AES-256-CBC, respectively. This option overrides IMGPROXY_SOURCE_URL_ENCRYPTION_KEY from process.env for one request.
 - `encryptIV` (`string | undefined`) - (optional, **PRO feature**) hex-encoded 16-bytes length IV for encrypting url. If not specified, the IV will be generated randomly. But it's better if you specify it yourself. Read more in [imgproxy docs iv-generation](https://docs.imgproxy.net/usage/encrypting_source_url#iv-generation).
+
+
+# Development
+
+The project uses [changesets](https://github.com/changesets/changesets) to manage versioning and changelog.
+Typical workflow is as follows:
+1. make changes to codebase,
+2. run `npm run changesets` at project root and follow prompt to generate a "changeset" (logging a change),
+3. commit both (1) and (2) into git.
+
+The [changesets Github action](./.github/workflows/publish.yml) is triggered on `push` to `main` and will create a corresponding "Changesets: Versioning & Publication" pull request, which, upon merged, will trigger publication of the new version to NPM.