chore: Add basic CI workflow

.ci/Project.toml

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+[deps]
+RegistryCI = "0c95cc5f-2f7e-43fe-82dd-79dbcba86b32"

.github/workflows/CI.yml

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+# This is a basic workflow to help you get started with Actions
+
+name: CI
+
+# Controls when the workflow will run
+on:
+  # Triggers the workflow on push or pull request events but only for the master branch
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  build:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Setup Julia environment
+        uses: julia-actions/setup-julia@v1
+
+      # Install dependencies
+      - run: julia --project=.ci -e 'using Pkg; Pkg.instantiate()'
+
+      # Run registry tests
+      - run: julia --project=.ci -e 'using RegistryCI; RegistryCI.test(registry_deps=["https://github.com/JuliaRegistries/General"])'