feat: Add workflow

.devcontainer/Dockerfile

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+FROM homebrew/brew:latest
+
+RUN brew install markdownlint-cli2 vale actionlint

.devcontainer/devcontainer.json

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+{
+  "build": { "dockerfile": "Dockerfile" },
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "esbenp.prettier-vscode",
+        "DavidAnson.vscode-markdownlint",
+        "redhat.vscode-yaml",
+        "errata-ai.vale-server",
+        "ms-azuretools.vscode-docker",
+        "GitHub.vscode-github-actions"
+      ]
+    }
+  }
+}

.github/CODEOWNERS

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+# These owners will be the default owners for everything in the repo
+
+* @oslokommune/kjoremiljo

.github/ISSUE_TEMPLATE/default-issue.md

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+---
+name: Default issue
+about: 'Default issue'
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+# Description
+
+<!-- More description in case title is not enough. A good description can be understood by everyone in the
+team at present time and in the future. -->
+
+# Motivation
+
+<!-- Why do we want to do what the issue describes? This is essential when we want to understand our
+decisions in the future. -->

.github/dependabot.yml

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+version: 2
+updates:
+
+  - package-ecosystem: "github-actions"
+    directory: "/.github/workflows"
+    schedule:
+      interval: "daily"
+    commit-message:
+      prefix: deps
+
+  - package-ecosystem: "github-actions"
+    directory: "/templates"
+    schedule:
+      interval: "daily"
+    commit-message:
+      prefix: deps

.github/linters/.yaml-lint.yml

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+---
+
+rules:
+
+  braces:
+    level: warning
+    min-spaces-inside: 0
+    max-spaces-inside: 0
+    min-spaces-inside-empty: 1
+    max-spaces-inside-empty: 5
+
+  brackets:
+    level: warning
+    min-spaces-inside: 0
+    max-spaces-inside: 0
+    min-spaces-inside-empty: 1
+    max-spaces-inside-empty: 5
+
+  colons:
+    level: warning
+    max-spaces-before: 0
+    max-spaces-after: 1
+
+  commas:
+    level: warning
+    max-spaces-before: 0
+    min-spaces-after: 1
+    max-spaces-after: 1
+
+  comments: disable
+
+  comments-indentation: disable
+
+  document-end: disable
+
+  document-start: disable
+
+  empty-lines:
+    level: warning
+    max: 2
+    max-start: 0
+    max-end: 0
+
+  hyphens:
+    level: warning
+    max-spaces-after: 1
+
+  indentation:
+    level: warning
+    spaces: consistent
+    indent-sequences: true
+    check-multi-line-strings: false
+
+  key-duplicates: enable
+
+  line-length: disable
+
+  new-line-at-end-of-file: disable
+
+  new-lines:
+    type: unix
+
+  trailing-spaces: disable

.github/pull_request_template.md

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+<!--- Provide a general summary of your changes in the Title above -->
+
+## Description
+<!--- Describe your changes in detail -->
+
+## Motivation and Context
+<!--- Why is this change required? What problem does it solve? -->
+<!--- If it fixes an open issue, please link to the issue here using the syntax: 'Closes #123' -->
+
+## How to prove the effect of this PR?
+<!--- Please describe in detail how verify the change you have done. -->
+<!--- In the context of a bug fix, this should include how to reproduce the bug. -->
+<!--- In the context of a feature, this should include how to demonstrate the feature. -->
+<!--- In the event of a pure code refactoring, just ignore this section -->
+
+## Additional info
+<!--- Ignore if not relevant -->
+<!--- For example screenshots -->
+
+## Is this a breaking change?
+<!--- Does the change require the user to change something on their side? -->
+
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+
+## Checklist
+<!--- Go over all the following points, and put an `x` in all the boxes that apply. -->
+<!--- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->
+
+- [ ] My change requires a change to the documentation, and I have updated the documentation accordingly.
+
+<!-- markdownlint-disable-file MD041 -->