chore: Automate release process (#7)

.github/pull_request_template.md

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+
+<!--
+The title of the pull request should follow the structure of https://www.conventionalcommits.org/:
+
+A few examples:
+
+feat: Added support for X and Y
+fix: Fixes a problem with Z
+-->
+
+### Description
+
+This Pull Request changes/fixes/enhances this thing...
+
+### Checklist
+
+Before the PR can be merged be sure the following are checked:
+* [ ] There are tests for the fix or feature added/changed

.github/release-please.yml

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+handleGHRelease: true
+manifest: true

.github/workflows/gem-push.yml

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+---
+  on:
+    push:
+      tags:
+      - v*.*.*
+
+  name: Build and push gem
+  jobs:
+    push:
+      runs-on: ubuntu-latest
+      permissions:
+        contents: write
+        id-token: write
+      steps:
+      - uses: rubygems/configure-rubygems-credentials@main
+        with:
+          role-to-assume: rg_oidc_akr_mrgtcg38wgdnv4n9vvyj
+      - uses: actions/checkout@v4
+      - name: Set remote URL
+        run: |
+          # Attribute commits to the last committer on HEAD
+          git config --global user.email "$(git log -1 --pretty=format:'%ae')"
+          git config --global user.name "$(git log -1 --pretty=format:'%an')"
+          git remote set-url origin "https://x-access-token:${{ secrets.GITHUB_TOKEN }}@github.com/$GITHUB_REPOSITORY"
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          bundler-cache: true
+          ruby-version: ruby
+      - name: Extract version number
+        run: echo "GEM_VERSION=${GITHUB_REF#refs/tags/v}" >> $GITHUB_ENV
+      - name: Release
+        run: bundle exec rake release
+      - name: Wait for release to propagate
+        run: |
+          gem install rubygems-await
+          gem_tuple="$(ruby -rbundler/setup -rbundler -e '
+              spec = Bundler.definition.specs.find {|s| s.name == ARGV[0] }
+              raise "No spec for #{ARGV[0]}" unless spec
+              print [spec.name, spec.version, spec.platform].join(":")
+            ' "jwk-loader")"
+          gem await "${gem_tuple}"

.github/workflows/pr-title.yml

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+name: PR Conventional Commit Validation
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened, edited]
+
+jobs:
+  validate-pr-title:
+    runs-on: ubuntu-latest
+    steps:
+      - name: PR Conventional Commit Validation
+        uses:  ytanikin/PRConventionalCommits@1.2.0
+        with:
+          task_types: '["feat","fix","docs","test","ci","refactor","perf","chore","revert"]'
+          add_label: 'false'