ci: Configure dependabot version updates (#15)

.changelog/15.txt

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+```release-note:enhancement
+ci/dependabot: Configure dependabot version updates
+```

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: "npm"
+    directory: "/"
+    schedule:
+      interval: "daily"
+      time: "08:00"
+      timezone: "America/Vancouver"
+    labels:
+      - "dependencies"
+      - "dependencies/npm"
+    commit-message:
+      prefix: "go deps:"
+      include: "scope"
+    open-pull-requests-limit: 10
+    assignees:
+      - "danroux"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"
+      time: "08:00"
+      timezone: "America/Vancouver"
+    labels:
+      - "dependencies"
+      - "dependencies/gha"
+    commit-message:
+      prefix: "gha deps:"
+      include: "scope"
+    open-pull-requests-limit: 10
+    assignees:
+      - "danroux"
+  - package-ecosystem: "docker"
+    directory: "/"
+    schedule:
+      interval: "daily"
+      time: "08:00"
+      timezone: "America/Vancouver"
+    labels:
+      - "dependencies"
+      - "dependencies/docker"
+    commit-message:
+      prefix: "docker deps:"
+      include: "scope"
+    open-pull-requests-limit: 10
+    assignees:
+      - "danroux"

.github/workflows/.dependabot_misc.yml

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+name: Dependabot Release Notes
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+# https://docs.github.com/en/actions/using-jobs/assigning-permissions-to-jobs#defining-access-for-the-github_token-scopes
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  generate-release-note:
+    if: github.actor == 'dependabot[bot]'
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633 # v4.1.2
+      with:
+        fetch-depth: 0
+    - name: Generate .changelog entry
+      env:
+        PR_NUMBER: ${{ github.event.pull_request.number }}
+        PR_TITLE: ${{ github.event.pull_request.title }}
+        PR_BODY: ${{ github.event.pull_request.body_text }}
+      run: |
+        FIRST_COMMIT=$(git log -10 --pretty=format:%H origin/main..HEAD | tail -1)
+        FIRST_COMMIT_BODY=$(git log -1 --pretty=format:%B $FIRST_COMMIT)
+        mkdir -p .changelog
+        echo "backticksrelease-note:enhancement" > .changelog/$PR_NUMBER.txt
+        echo "ci/dependabot: $PR_TITLE" >> .changelog/$PR_NUMBER.txt
+        echo ""  >> .changelog/$PR_NUMBER.txt
+        echo "$FIRST_COMMIT_BODY" >> .changelog/$PR_NUMBER.txt
+        echo "backticks" >> .changelog/$PR_NUMBER.txt
+        sed -i 's/backticks/```/g' .changelog/$PR_NUMBER.txt
+    - name: Commit and Push
+      env:
+        GIT_USER: ${{ secrets.GIT_USER }}
+        GIT_TOKEN: ${{ secrets.GIT_TOKEN }}
+      run: |
+        git config --local user.email "dependabot[bot]@users.noreply.github.com"
+        git config --local user.name "dependabot[bot]"
+        git add .changelog
+        git commit -m "Add .changelog entry #${{ github.event.pull_request.number }}"
+        git push "https://x-access-token:$GITHUB_TOKEN@github.com/${{ github.repository }}.git" HEAD:${{ github.event.pull_request.head.ref }}