Add github CI workflow

.github/workflows/ci.yml

@@ -0,0 +1,62 @@
+name: Elixir CI
+
+on:
+    push:
+        branches: [ master ]
+    pull_request:
+        branches: [ master ]
+
+permissions:
+    contents: read
+
+jobs:
+    test:
+        runs-on: ubuntu-22.04
+        env:
+          MIX_ENV: test
+        steps:
+        - uses: actions/checkout@v4
+        - uses: erlef/setup-elixir@v1
+          with:
+            elixir-version: '1.16.2-otp-26'
+            otp-version: '26.2.3'
+        - uses: actions/cache@v4
+          id: mix-cache
+          with:
+              path: deps
+              key: ${{ runner.os }}-mix-${{ hashFiles(format('{0}{1}', github.workspace, '/mix.lock')) }}
+        - if: steps.mix-cache.outputs.cache-hit != 'true'
+          run: mix deps.get
+        - run: mix test
+
+    lint:
+        runs-on: ubuntu-22.04
+        steps:
+        - uses: actions/checkout@v4
+        - uses: erlef/setup-beam@v1
+          with:
+            elixir-version: '1.16.2-otp-26'
+            otp-version: '26.2.3'
+        - uses: erlef/setup-elixir@v1
+          with:
+            elixir-version: '1.16.2-otp-26'
+            otp-version: '26.2.3'
+        - uses: actions/cache@v4
+          id: mix-cache
+          with:
+              path: deps
+              key: ${{ runner.os }}-mix-${{ hashFiles(format('{0}{1}', github.workspace, '/mix.lock')) }}
+        - if: steps.mix-cache.outputs.cache-hit != 'true'
+          run: mix deps.get
+        - run: mix format --check-formatted
+        - run: mix credo --strict
+        - uses: actions/cache@v4
+          id: plt-cache
+          with:
+            path: priv/plts
+            key: ${{ runner.os }}-plts-${{ hashFiles(format('{0}{1}', github.workspace, '/mix.lock')) }}
+        - if: steps.plt-cache.outputs.cache-hit != 'true'
+          run: |
+            mkdir -p priv/plts
+            mix dialyzer --plt
+        - run: mix dialyzer --no-check --halt-exit-status