ci: switch to GitHub Actions

Signed-off-by: Wolfgang Walther <walther@technowledgy.de>

.circleci/config.yml

@@ -1,45 +0,0 @@
-version: 2.1
-
-jobs:
-  build:
-    docker:
-      - image: nixos/nix:2.3
-    steps:
-      - checkout
-      - run:
-          name: Install build script
-          command: nix-env -f default.nix -iA build
-      - run:
-          name: Build docs
-          command: postgrest-docs-build
-
-  spellcheck:
-    docker:
-      - image: nixos/nix:2.3
-    steps:
-      - checkout
-      - run:
-          name: Install spellcheck script
-          command: nix-env -f default.nix -iA spellcheck
-      - run:
-          name: Run spellcheck
-          command: postgrest-docs-spellcheck
-
-  linkcheck:
-    docker:
-      - image: nixos/nix:2.3
-    steps:
-      - checkout
-      - run:
-          name: Install linkcheck script
-          command: nix-env -f default.nix -iA linkcheck
-      - run:
-          name: Run linkcheck
-          command: postgrest-docs-linkcheck
-
-workflows:
-  check:
-    jobs:
-      - build
-      - spellcheck
-      - linkcheck

.github/dependabot.yml

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

.github/workflows/ci.yaml

@@ -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/checkout@v2.4.0
+    - 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/checkout@v2.4.0
+    - 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/checkout@v2.4.0
+    - uses: cachix/install-nix-action@v16
+    - run: nix-env -f default.nix -iA linkcheck
+    - run: postgrest-docs-linkcheck
+