Initial commit with utils image

.github/workflows/build-push-artifacts.yaml

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+name: Publish artifacts
+# Run the tasks on every push
+on: push
+jobs:
+  build_push_utils_image:
+    name: Build and push utils image
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out the repository
+        uses: actions/checkout@v2
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+        with:
+          platforms: all
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Set up Docker layer caching
+        uses: actions/cache@v2
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-api-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-api-
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Calculate metadata for image
+        id: image-meta
+        uses: docker/metadata-action@v3
+        with:
+          images: ghcr.io/stackhpc/k8s-utils
+          # Produce the branch name or tag and the SHA as tags
+          tags: |
+            type=ref,event=branch
+            type=ref,event=tag
+            type=sha,prefix=
+
+      - name: Build and push image
+        uses: docker/build-push-action@v2
+        with:
+          context: ./utils
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: ${{ steps.image-meta.outputs.tags }}
+          labels: ${{ steps.image-meta.outputs.labels }}
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache-new,mode=max
+
+      # Temp fix
+      # https://github.com/docker/build-push-action/issues/252
+      # https://github.com/moby/buildkit/issues/1896
+      # https://github.com/docker/buildx/pull/535
+      - name: Move cache
+        run: |
+          rm -rf /tmp/.buildx-cache
+          mv /tmp/.buildx-cache-new /tmp/.buildx-cache

README.md

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+# capi-helm-charts
+
+This repository contains Helm charts that can be used to deploy Cluster API resources.

utils/Dockerfile

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+#####
+## Build specification for a container image containing tools that are useful
+## for deploying applications
+##
+## It is designed to be run as a job inside the target cluster
+#####
+
+FROM alpine
+
+# Install some useful tools
+RUN apk add --no-cache curl jq
+
+# Because of the version skew policy, which only guarantees compatibility with a skew
+# of one minor version, we must install a bunch of kubectl versions
+ARG KUBECTL_VERSIONS="v1.22.0 v1.21.4 v1.20.10 v1.19.14 v1.18.20 v1.17.17"
+RUN set -ex; \
+    OS_ARCH="$(uname -m)"; \
+    case "$OS_ARCH" in \
+        x86_64) kubectl_arch=amd64 ;; \
+        aarch64) kubectl_arch=arm64 ;; \
+        *) false ;; \
+    esac; \
+    for kubectl_version in $KUBECTL_VERSIONS; do \
+        kubectl_minor_version=${kubectl_version%.*}; \
+        kubectl_latest_version=${kubectl_latest_version:-$kubectl_minor_version}; \
+        kubectl_url=https://dl.k8s.io/release/$kubectl_version/bin/linux/$kubectl_arch/kubectl; \
+        kubectl_exe=/usr/bin/kubectl-$kubectl_minor_version; \
+        curl -fsSL $kubectl_url -o $kubectl_exe; \
+        chmod +x $kubectl_exe; \
+    done; \
+    ln -s /usr/bin/kubectl-$kubectl_latest_version /usr/bin/kubectl-latest
+
+# This script uses the latest version to discover the version of the Kubernetes
+# cluster before picking the correct version to use
+COPY ./kubectl-shim /usr/bin/kubectl
+
+ARG HELM_VERSION=v3.6.3
+RUN set -ex; \
+    OS_ARCH="$(uname -m)"; \
+    case "$OS_ARCH" in \
+        x86_64) helm_arch=amd64 ;; \
+        aarch64) helm_arch=arm64 ;; \
+        *) false ;; \
+    esac; \
+    curl -fsSL https://get.helm.sh/helm-$HELM_VERSION-linux-$helm_arch.tar.gz | \
+      tar -xz --strip-components 1 -C /usr/bin linux-$helm_arch/helm

utils/kubectl-shim

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+#!/bin/sh
+
+set -eo pipefail
+
+server_version="$(kubectl-latest version -o json | jq '"v" + .serverVersion.major + "." + .serverVersion.minor')"
+exec kubectl-$server_version "$@"