ci: switch to GitHub Actions

Signed-off-by: Wolfgang Walther <[email protected]>

Author: wolfgangwalther

Diff for: .circleci/config.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+- package-ecosystem: github-actions
+  directory: /
+  schedule:
+    interval: weekly

Diff for: .github/dependabot.yml

@@ -0,0 +1,40 @@
+name: CI
+
+on:
+  push:
+    branches:
+    - main
+    - v*
+  pull_request:
+    branches:
+    - main
+    - v*
+
+jobs:
+  build:
+    name: Build docs
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/[email protected]
+    - uses: cachix/install-nix-action@v16
+    - run: nix-env -f default.nix -iA build
+    - run: postgrest-docs-build
+
+  spellcheck:
+    name: Run spellcheck
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/[email protected]
+    - uses: cachix/install-nix-action@v16
+    - run: nix-env -f default.nix -iA spellcheck
+    - run: postgrest-docs-spellcheck
+
+  linkcheck:
+    name: Run linkcheck
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/[email protected]
+    - uses: cachix/install-nix-action@v16
+    - run: nix-env -f default.nix -iA linkcheck
+    - run: postgrest-docs-linkcheck
+