First implementation of setup buildx action (#1)

.github/workflows/main.yml

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+name: e2e
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - "*"
+
+permissions:
+  id-token: write # This is required for requesting the JWT
+  contents: read # This is required for actions/checkout
+
+jobs:
+  build_and_push:
+    runs-on: ubuntu-latest
+    name: Build and push a sample application to Namespace Cloud
+    timeout-minutes: 5
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Set up Namespace Cloud CLI
+        id: nscloud
+        uses: namespacelabs/[email protected]
+      - name: Configure buildx
+        uses: ./ # Uses an action in the root directory
+      - name: Build and push
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          file: .github/workflows/testdata/Dockerfile
+          push: ${{ github.ref_name == 'main' }}
+          tags: "${{ steps.nscloud.outputs.registry-address }}/nscloud-setup-buildx-action/testdata/server:latest"
+          cache-from: "type=registry,ref=${{ steps.nscloud.outputs.registry-address }}/nscloud-setup-buildx-action/testdata/server:buildcache"
+          cache-to: "type=registry,ref=${{ steps.nscloud.outputs.registry-address }}/nscloud-setup-buildx-action/testdata/server:buildcache,mode=max"

.github/workflows/testdata/Dockerfile

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+FROM alpine:3.17.2
+CMD ["echo", "Hello Namespace!"]

.gitignore

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+node_modules/

README.md

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+# Create a Namespace Cloud cluster
+
+This repository hosts a GitHub action that configures buildx to use a
+[Namespace Cloud](https://cloud.namespace.so) build cluster.
+
+## Example
+
+```yaml
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    # These permissions are needed to interact with GitHub's OIDC Token endpoint.
+    permissions:
+      id-token: write
+      contents: read
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Install and configure Namespace Cloud CLI
+        uses: namespacelabs/[email protected]
+      - name: Configure buildx
+        uses: namespacelabs/[email protected]
+      - name: Build and push
+        uses: docker/build-push-action@v4
+        with:
+          push: true
+          tags: user/app:latest
+```
+
+## Requirements
+
+This action uses `nsc`, the Namespace Cloud CLI.
+You can add it to your workflow using [namespacelabs/nscloud-setup](https://github.com/namespacelabs/nscloud-setup)
+(see [example](#example)).

action.yml

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+name: '"Configure buildx with Namespace Cloud" Action For GitHub Actions'
+description: "Configure buildx to use the Namespace Cloud build cluster"
+
+runs:
+  using: node16
+  main: dist/main/index.js
+  post: dist/post/index.js

common.ts

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+import * as path from "path";
+import * as fs from "fs";
+
+export const SessionId = "NscBuildkitProxySession";
+
+export function tmpFile(file: string): string {
+	const tmpDir = path.join(process.env.RUNNER_TEMP, "ns");
+
+	if (!fs.existsSync(tmpDir)) {
+		fs.mkdirSync(tmpDir);
+	}
+
+	return path.join(tmpDir, file);
+}