feat(ci): publish helm chart (#3)

Publish helm chart artifact to GHCR

Author: ChandonPierre

.github/workflows/publish-chart.yaml

@@ -0,0 +1,48 @@
+---
+# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json
+name: "Charts: Publish to GHCR OCI"
+
+on:
+  workflow_dispatch: {}
+  pull_request:
+    branches: ["coreweave"]
+    types: ["opened", "synchronize", "reopened"]
+    paths:
+      - .github/workflows/publish-chart.yaml
+      - "**/*"
+
+jobs:
+  publish-charts:
+    name: Publish chart
+    permissions:
+      contents: write
+      packages: write
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set VERSION from VERSION.txt
+        id: set_version
+        run: echo "VERSION=$(cat VERSION.txt)" >> $GITHUB_ENV
+
+      - name: Set HELM_VERSION
+        run: echo "HELM_VERSION=${{ env.VERSION }}-${GITHUB_SHA::7}" >> $GITHUB_ENV
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Install Helm
+        uses: azure/setup-helm@v4
+
+      - name: Package & Push Helm Charts
+        shell: bash
+        run: |
+          helm package cmd/k8s-operator/deploy/chart --dependency-update --version ${{ env.HELM_VERSION }} --app-version ${{ env.HELM_VERSION }}
+          pkg=$(ls tailscale-operator-*.tgz)
+          helm push "${pkg}" oci://ghcr.io/${{ github.repository }}/chart