Adds release process to hex.pm (#51)

* Adds markdownlint

- CONTRIBUTING.md:5 MD001/heading-increment Heading levels should only increment by one level at a time [Expected: h3; Actual: h4]

- README.md:66:234 MD009/no-trailing-spaces Trailing spaces [Expected: 0 or 2; Actual: 1]

* Adds YAMLlint

./.github/dependabot.yml
  1:1       warning  missing document start "---"  (document-start)

./.github/workflows/check_deps.yml
  1:1       warning  missing document start "---"  (document-start)

./.github/workflows/ci.yml
  1:1       warning  missing document start "---"  (document-start)
  6:16      error    too many spaces inside brackets  (brackets)
  6:23      error    too many spaces inside brackets  (brackets)

* Adds YAMLlint and Markdown linter to CI

* Adds release process to hex.pm

- Adds CHANGELOG.md file
- Updates CONTRIBUTING.md file

* Adds app description for hex.pm

.github/workflows/release.yml

@@ -0,0 +1,20 @@
+---
+
+name: Release
+
+on:
+  push:
+    tags:
+      - v*.*.*
+
+jobs:
+  publish:
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Check out
+        uses: actions/checkout@v4
+
+      - name: Publish to Hex.pm
+        uses: erlangpack/github-action@v3
+        env:
+          HEX_API_KEY: ${{ secrets.HEX_API_KEY }}

CHANGELOG.md

@@ -0,0 +1,24 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## main
+
+### Changed
+
+- Bumps to OTP/27
+- Replaced "jsx" with "json"
+
+### Added
+
+- Erlfmt
+- CONTRIBUTING.md
+- CHANGELOG.md
+- Release process to hex.pm
+
+## 1.1.0
+
+- ...

CONTRIBUTING.md

@@ -1,4 +1,4 @@
-# Contributing to DNSimple/dns_erlang
+# Contributing to dns_erlang
 
 ## Getting started
 
@@ -13,47 +13,72 @@ cd dns_erlang
 
 ### 2. Install Erlang
 
-### 3. Create your own working branch
+### 3. Install the dependencies
 
 ```shell
-git checkout -b dev_new_feature_xyz
+make
 ```
 
-### 3. Build and test
+#### Updating Dependencies
 
-Compile the project and [run the test suite](#testing) to check everything works as expected.
+When dependencies are updated the rebar.lock file will need to be updated for the new dependency to be used. The following command does this:
 
 ```shell
-make all
+./rebar3 upgrade --all
 ```
 
-## Testing
+## Formatting
+
+If your editor doesn't automatically format Erlang code using [erlfmt](https://github.com/WhatsApp/erlfmt), run:
 
 ```shell
-make test
+make format
 ```
 
-## Formatting
+You should run this command before releasing.
+
+### 3. Build and test
 
-To format the codebase:
+Compile the project and [run the test suite](#testing) to check everything works as expected.
+
+## Testing
 
 ```shell
-make format
+make test
 ```
 
 ## Releasing
 
+The following instructions uses `$VERSION` as a placeholder, where `$VERSION` is a `MAJOR.MINOR.BUGFIX` release such as `1.2.0`.
+
 1. Run the test suite and ensure all the tests pass.
 
-2. Commit and push the changes
+1. Set the version in `src/dns_erlang.app.src` & `src/bugsnag.erl`
+
+1. Run the test suite and ensure all the tests pass.
+
+1. Finalize the `## main` section in `CHANGELOG.md` assigning the version.
+
+1. Commit and push the changes
 
     ```shell
-    git commit -a -m "* <adding feature/enhancement X/Y/Z"
-    git push origin dev_new_feature_xyz
+    git commit -a -m "Release $VERSION"
+    git push origin main
     ```
 
-3. Initiate PR for reviewing and merging upstream.
+1. Wait for CI to complete.
+
+1. Create a signed tag.
+
+    ```shell
+    git tag -a v$VERSION -s -m "Release $VERSION"
+    git push origin --tags
+    ```
+
+1. GitHub actions will take it from there and release to <https://hex.pm/packages/dns_erlang>
 
 ## Tests
 
-Please be sure to submit unit tests for your changes. You can test your changes on your machine by [running the test suite](#testing).
+Submit unit tests for your changes. You can test your changes on your machine by [running the test suite](#testing).
+
+When you submit a PR, tests will also be run on the [continuous integration environment via GitHub Actions](https://github.com/dnsimple/dnsimple-ruby/actions/workflows/ci.yml).

src/dns_erlang.app.src

@@ -1,5 +1,5 @@
 {application, dns_erlang, [
-    {description, "DNS library"},
+    {description, "An Erlang DNS message library that supports most common record types, TSIG authenticated messages, EDNS0 and DNSSEC."},
     {vsn, "1.1.0"},
     {licenses, ["Apache"]},
     {modules, []},