Add simplified helm chart (#2905)

As discussed yesterday, a simplified version of [my
helm](https://github.com/S7evinK/dendrite-helm) which deploys a monolith
with internal NATS and an optionally enabled PostgreSQL server. If the
PostgreSQL dependency is not enabled, a user specified connection string
is constructed.

Co-authored-by: kegsay <kegan@matrix.org>

.github/workflows/gh-pages.yml

@@ -0,0 +1,52 @@
+# Sample workflow for building and deploying a Jekyll site to GitHub Pages
+name: Deploy GitHub Pages dependencies preinstalled
+
+on:
+  # Runs on pushes targeting the default branch
+  push:
+    branches: ["main"]
+    paths:
+      - 'docs/**' # only execute if we have docs changes
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# Allow one concurrent deployment
+concurrency:
+  group: "pages"
+  cancel-in-progress: true
+
+jobs:
+  # Build job
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Setup Pages
+        uses: actions/configure-pages@v2
+      - name: Build with Jekyll
+        uses: actions/jekyll-build-pages@v1
+        with:
+          source: ./docs
+          destination: ./_site
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v1
+
+  # Deployment job
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v1

.github/workflows/helm.yml

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+name: Release Charts
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - 'helm/**' # only execute if we have helm chart changes
+
+jobs:
+  release:
+    # depending on default permission settings for your org (contents being read-only or read-write for workloads), you will have to add permissions
+    # see: https://docs.github.com/en/actions/security-guides/automatic-token-authentication#modifying-the-permissions-for-the-github_token
+    permissions:
+      contents: write
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Configure Git
+        run: |
+          git config user.name "$GITHUB_ACTOR"
+          git config user.email "$GITHUB_ACTOR@users.noreply.github.com"
+
+      - name: Install Helm
+        uses: azure/setup-helm@v3
+        with:
+          version: v3.10.0
+
+      - name: Run chart-releaser
+        uses: helm/chart-releaser-action@v1.4.1
+        env:
+          CR_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+        with:
+          config: helm/cr.yaml
+          charts_dir: helm/

.github/workflows/k8s.yml

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+name: k8s
+
+on:
+  push:
+    branches: ["main"]
+    paths:
+      - 'helm/**' # only execute if we have helm chart changes
+  pull_request:
+    branches: ["main"]
+    paths:
+      - 'helm/**'
+
+jobs:
+  lint:
+    name: Lint Helm chart
+    runs-on: ubuntu-latest
+    outputs:
+      changed: ${{ steps.list-changed.outputs.changed }}
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - uses: azure/setup-helm@v3
+        with:
+          version: v3.10.0
+      - uses: actions/setup-python@v4
+        with:
+          python-version: 3.11
+          check-latest: true
+      - uses: helm/chart-testing-action@v2.3.1
+      - name: Get changed status
+        id: list-changed
+        run: |
+          changed=$(ct list-changed --config helm/ct.yaml --target-branch ${{ github.event.repository.default_branch }})
+          if [[ -n "$changed" ]]; then
+              echo "::set-output name=changed::true"
+          fi
+
+      - name: Run lint
+        run: ct lint --config helm/ct.yaml
+
+  # only bother to run if lint step reports a change to the helm chart
+  install:
+    needs:
+      - lint
+    if: ${{ needs.lint.outputs.changed == 'true' }}
+    name: Install Helm charts
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+          ref: ${{ inputs.checkoutCommit }}
+      - name: Install Kubernetes tools
+        uses: yokawasa/action-setup-kube-tools@v0.8.2
+        with:
+          setup-tools: |
+            helmv3
+          helm: "3.10.3"
+      - uses: actions/setup-python@v4
+        with:
+          python-version: "3.10"
+      - name: Set up chart-testing
+        uses: helm/chart-testing-action@v2.3.1
+      - name: Create k3d cluster
+        uses: nolar/setup-k3d-k3s@v1
+        with:
+          version: v1.21
+      - name: Remove node taints
+        run: |
+          kubectl taint --all=true nodes node.cloudprovider.kubernetes.io/uninitialized- || true
+      - name: Run chart-testing (install)
+        run: ct install --config helm/ct.yaml
+
+      # Install the chart using helm directly and test with create-account
+      - name: Install chart
+        run: |
+          helm install --values helm/dendrite/ci/ct-postgres-sharedsecret-values.yaml dendrite helm/dendrite
+      - name: Wait for Postgres and Dendrite to be up
+        run: |
+          kubectl wait --for=condition=ready --timeout=90s pod -l app.kubernetes.io/name=postgresql || kubectl get pods -A
+          kubectl wait --for=condition=ready --timeout=90s pod -l app.kubernetes.io/name=dendrite || kubectl get pods -A
+          kubectl get pods -A
+          kubectl get services
+          kubectl get ingress
+      - name: Run create account
+        run: |
+          podName=$(kubectl get pods -l app.kubernetes.io/name=dendrite -o name)
+          kubectl exec "${podName}" -- /usr/bin/create-account -username alice -password somerandompassword