Add initial port of shutdown await from bash to Go

* Based on https://www.psdn.io/posts/kubelet-graceful-shutdown/

.github/dependabot.yaml

@@ -0,0 +1,23 @@
+version: 2
+updates:
+- package-ecosystem: "github-actions"
+  directory: "/"
+  schedule:
+    interval: "daily"
+- package-ecosystem: docker
+  directory: "/"
+  schedule:
+    interval: daily
+  pull-request-branch-name:
+    separator: "-"
+  open-pull-requests-limit: 1
+- package-ecosystem: gomod
+  directory: "/"
+  schedule:
+    interval: daily
+  pull-request-branch-name:
+    separator: "-"
+  open-pull-requests-limit: 2
+  ignore:
+    - dependency-name: "k8s.io/api"
+    - dependency-name: "k8s.io/apimachinery"

.github/workflows/test.yaml

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+name: test
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+jobs:
+  build:
+    name: go
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        go: ['1.18', '1.19']
+    steps:
+      - name: setup
+        uses: actions/setup-go@v3
+        with:
+          go-version: ${{matrix.go}}
+
+      - name: checkout
+        uses: actions/checkout@v3
+
+      - name: test
+        run: make

.gitignore

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+bin/

.golangci.yaml

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+linters:
+  enable:
+    - goheader
+linters-settings:
+  goheader:
+    template: |-
+      Copyright (C) {{year}} Poseidon Labs
+      Copyright (C) {{year}} Dalton Hubble
+
+      This Source Code Form is subject to the terms of the Mozilla Public
+      License, v. 2.0. If a copy of the MPL was not distributed with this
+      file, You can obtain one at https://mozilla.org/MPL/2.0/.
+

CHANGELOG.md

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+# scuttle
+
+Notable changes between versions.
+
+## Latest
+
+## v0.1.0
+
+* Initial port from bash script to Go
+* Make uncordon, drain, and delete optional
+* Poll AWS spot instance termination notices
+* Drop requirement that `kubectl` be present

Dockerfile

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+FROM docker.io/golang:1.19.3 AS builder
+COPY . src
+RUN cd src && make build
+
+FROM docker.io/alpine:3.16.2
+LABEL maintainer="Dalton Hubble <dghubble@gmail.com>"
+RUN apk --no-cache --update add ca-certificates
+COPY --from=builder /go/src/bin/scuttle /usr/local/bin
+ENTRYPOINT ["/usr/local/bin/scuttle"]