Added CI & dependabot setup

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: "mix"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    commit-message:
+      prefix: "deps"
+      include: "scope"
+    open-pull-requests-limit: 10
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    open-pull-requests-limit: 10
+
+  - package-ecosystem: "npm"
+    directory: "/assets"
+    open-pull-requests-limit: 5
+    schedule:
+      interval: "daily"

.github/workflows/dependabot_merge.yml

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+name: Dependabot auto-merge
+on: pull_request
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  dependabot:
+    runs-on: ubuntu-latest
+    if: ${{ github.actor == 'dependabot[bot]' }}
+    steps:
+      - name: Dependabot metadata
+        id: metadata
+        uses: dependabot/fetch-metadata@v1
+        with:
+          github-token: "${{ secrets.GITHUB_TOKEN }}"
+      - name: Enable auto-merge for Dependabot PRs
+        if: ${{steps.metadata.outputs.update-type == 'version-update:semver-patch'}}
+        run: gh pr merge --auto --merge "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}

.github/workflows/elixir_ci.yml

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+name: Elixir CI
+
+on: push
+
+env:
+  MIX_ENV: test
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: earthly/actions-setup@v1
+      - uses: actions/checkout@v4
+      - run: earthly -P --ci +ci

Earthfile

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+VERSION 0.7
+ARG elixir_version=1.16.1
+ARG otp_version=26.2.1
+ARG debian_version=bookworm-20231120-slim
+FROM hexpm/elixir:$elixir_version-erlang-$otp_version-debian-$debian_version
+
+ci:
+  BUILD +lint
+  BUILD +test
+
+lint:
+  FROM +lint-setup
+  COPY --dir lib test ./
+  COPY .formatter.exs ./
+  RUN mix format --check-formatted
+  RUN mix xref graph --format cycles --fail-above 76
+
+test:
+  FROM +test-setup
+  COPY --dir lib test ./
+  RUN MIX_ENV=test mix compile
+  RUN mix test
+
+setup-base:
+   RUN apt-get update && apt install -y build-essential git && apt-get clean
+   ENV ELIXIR_ASSERT_TIMEOUT=10000
+   WORKDIR /code
+   RUN mix local.rebar --force
+   RUN mix local.hex --force
+   COPY mix.exs .
+   COPY mix.lock .
+   RUN mix deps.get
+
+test-setup:
+   FROM +setup-base
+   ENV MIX_ENV=test
+   RUN mix deps.compile
+
+lint-setup:
+  FROM +setup-base
+  RUN mix deps.compile
+  RUN mix dialyzer --plt