mcp pgadmin example (#14)

* Added kcp-multicluster-provider-example for kubecon 2025 workshop

* mount servers.json configmap and generate pgpassfile

* added goreleaser gh workflow

---------

Co-authored-by: Mangirdas Judeikis <Mangirdas@Judeikis.LT>

Author: gman0

.github/workflows/goreleaser.yml

@@ -0,0 +1,47 @@
+name: goreleaser
+
+on:
+  pull_request:
+    paths:
+      - .github/workflows/goreleaser.yml
+      - 20250401-kubecon-london/workshop/kcp-multicluster-provider-example/.goreleaser.yaml
+  push:
+    tags:
+      - 'v1-kubecon2025-london'
+
+permissions:
+  contents: read
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: write
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: v1.22.10
+
+      - name: Run GoReleaser on tag
+        if: github.event_name != 'pull_request'
+        uses: goreleaser/goreleaser-action@v6
+        with:
+          distribution: goreleaser
+          version: latest
+          args: release --timeout 60m
+          workdir: 20250401-kubecon-london/workshop/kcp-multicluster-provider-example
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+ 
+      - uses: actions/upload-artifact@v4
+        if: github.event_name == 'release'
+        with:
+          name: binaries
+          path: dist/*.tar.gz

20250401-kubecon-london/workshop/kcp-multicluster-provider-example/.devcontainer/devcontainer.json

@@ -0,0 +1,25 @@
+{
+  "name": "Kubebuilder DevContainer",
+  "image": "docker.io/golang:1.23",
+  "features": {
+    "ghcr.io/devcontainers/features/docker-in-docker:2": {},
+    "ghcr.io/devcontainers/features/git:1": {}
+  },
+
+  "runArgs": ["--network=host"],
+
+  "customizations": {
+    "vscode": {
+      "settings": {
+        "terminal.integrated.shell.linux": "/bin/bash"
+      },
+      "extensions": [
+        "ms-kubernetes-tools.vscode-kubernetes-tools",
+        "ms-azuretools.vscode-docker"
+      ]
+    }
+  },
+
+  "onCreateCommand": "bash .devcontainer/post-install.sh"
+}
+

20250401-kubecon-london/workshop/kcp-multicluster-provider-example/.devcontainer/post-install.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+set -x
+
+curl -Lo ./kind https://kind.sigs.k8s.io/dl/latest/kind-linux-amd64
+chmod +x ./kind
+mv ./kind /usr/local/bin/kind
+
+curl -L -o kubebuilder https://go.kubebuilder.io/dl/latest/linux/amd64
+chmod +x kubebuilder
+mv kubebuilder /usr/local/bin/
+
+KUBECTL_VERSION=$(curl -L -s https://dl.k8s.io/release/stable.txt)
+curl -LO "https://dl.k8s.io/release/$KUBECTL_VERSION/bin/linux/amd64/kubectl"
+chmod +x kubectl
+mv kubectl /usr/local/bin/kubectl
+
+docker network create -d=bridge --subnet=172.19.0.0/24 kind
+
+kind version
+kubebuilder version
+docker --version
+go version
+kubectl version --client

20250401-kubecon-london/workshop/kcp-multicluster-provider-example/.dockerignore

@@ -0,0 +1,3 @@
+# More info: https://docs.docker.com/engine/reference/builder/#dockerignore-file
+# Ignore build and test binaries.
+bin/

20250401-kubecon-london/workshop/kcp-multicluster-provider-example/.gitignore

@@ -0,0 +1,28 @@
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+bin/*
+Dockerfile.cross
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Go workspace file
+go.work
+
+# Kubernetes Generated files - skip generated files, except for vendored files
+!vendor/**/zz_generated.*
+
+# editor and IDE paraphernalia
+.idea
+.vscode
+*.swp
+*.swo
+*~
+dist/*

20250401-kubecon-london/workshop/kcp-multicluster-provider-example/.golangci.yml

@@ -0,0 +1,47 @@
+run:
+  timeout: 5m
+  allow-parallel-runners: true
+
+issues:
+  # don't skip warning about doc comments
+  # don't exclude the default set of lint
+  exclude-use-default: false
+  # restore some of the defaults
+  # (fill in the rest as needed)
+  exclude-rules:
+    - path: "api/*"
+      linters:
+        - lll
+    - path: "internal/*"
+      linters:
+        - dupl
+        - lll
+linters:
+  disable-all: true
+  enable:
+    - dupl
+    - errcheck
+    - copyloopvar
+    - ginkgolinter
+    - goconst
+    - gocyclo
+    - gofmt
+    - goimports
+    - gosimple
+    - govet
+    - ineffassign
+    - lll
+    - misspell
+    - nakedret
+    - prealloc
+    - revive
+    - staticcheck
+    - typecheck
+    - unconvert
+    - unparam
+    - unused
+
+linters-settings:
+  revive:
+    rules:
+      - name: comment-spacings

20250401-kubecon-london/workshop/kcp-multicluster-provider-example/.goreleaser.yaml

@@ -0,0 +1,37 @@
+# Copyright 2025 The KCP Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+builds:
+  - id: "mcp-example-crd"
+    main: cmd/main.go
+    binary: mcp-example-crd
+    ldflags:
+      - "-s -w"
+    goos:
+      - linux
+      - darwin
+    goarch:
+      - amd64
+      - arm64
+    env:
+      - CGO_ENABLED=0
+
+archives:
+  - id: mcp-example-crd
+    builds:
+      - mcp-example-crd
+
+release:
+  draft: true
+  mode: keep-existing

20250401-kubecon-london/workshop/kcp-multicluster-provider-example/Dockerfile

@@ -0,0 +1,33 @@
+# Build the manager binary
+FROM docker.io/golang:1.23 AS builder
+ARG TARGETOS
+ARG TARGETARCH
+
+WORKDIR /workspace
+# Copy the Go Modules manifests
+COPY go.mod go.mod
+COPY go.sum go.sum
+# cache deps before building and copying source so that we don't need to re-download as much
+# and so that source changes don't invalidate our downloaded layer
+RUN go mod download
+
+# Copy the go source
+COPY cmd/main.go cmd/main.go
+COPY api/ api/
+COPY internal/ internal/
+
+# Build
+# the GOARCH has not a default value to allow the binary be built according to the host where the command
+# was called. For example, if we call make docker-build in a local env which has the Apple Silicon M1 SO
+# the docker BUILDPLATFORM arg will be linux/arm64 when for Apple x86 it will be linux/amd64. Therefore,
+# by leaving it empty we can ensure that the container and binary shipped on it will have the same platform.
+RUN CGO_ENABLED=0 GOOS=${TARGETOS:-linux} GOARCH=${TARGETARCH} go build -a -o manager cmd/main.go
+
+# Use distroless as minimal base image to package the manager binary
+# Refer to https://github.com/GoogleContainerTools/distroless for more details
+FROM gcr.io/distroless/static:nonroot
+WORKDIR /
+COPY --from=builder /workspace/manager .
+USER 65532:65532
+
+ENTRYPOINT ["/manager"]