Some improvements to CI setup

* Install dependabot
* Define concurrency groups
* Run only on minimum support version, latest stable and nightly
* Don't run CI on impossible combinations of architectures
* Fix codecov setup
* Simplify documentation job

.github/dependabot.yml

@@ -0,0 +1,7 @@
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "weekly"

.github/workflows/ci.yml

@@ -1,4 +1,5 @@
 name: CI
+
 on:
   pull_request:
     branches:
@@ -7,6 +8,13 @@ on:
     branches:
       - master
     tags: '*'
+
+concurrency:
+  # Skip intermediate builds: always.
+  # Cancel intermediate builds: on PRs.
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
+
 jobs:
   test:
     name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
@@ -16,60 +24,38 @@ jobs:
       matrix:
         version:
           - '1.6'
-          - '1.7'
-          - '1.9'
-          - '1.10'
           - '1' # automatically expands to the latest stable 1.x release of Julia
           - 'nightly'
         os:
           - ubuntu-latest
-        arch:
-          - x64
-        include:
+          - macos-13
+          - macos-latest
+        exclude:
           - os: macos-latest
-            version: '1'
-            arch: aarch64
-          - os: ubuntu-latest
-            version: 'nightly'
-            arch: aarch64
-            allow_failure: true
+            version: '1.6'
     steps:
-      - uses: actions/checkout@v3
-      - uses: julia-actions/setup-julia@v1
+      - uses: actions/checkout@v4
+      - uses: julia-actions/setup-julia@v2
         with:
           version: ${{ matrix.version }}
-          arch: ${{ matrix.arch }}
-      - uses: actions/cache@v3
-        env:
-          cache-name: cache-artifacts
-        with:
-          path: ~/.julia/artifacts
-          key: ${{ runner.os }}-test-${{ env.cache-name }}-${{ hashFiles('**/Project.toml') }}
-          restore-keys: |
-            ${{ runner.os }}-test-${{ env.cache-name }}-
-            ${{ runner.os }}-test-
-            ${{ runner.os }}-
+      - uses: julia-actions/cache@v2
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-runtest@v1
-#      - uses: julia-actions/julia-processcoverage@v1
-#      - uses: codecov/codecov-action@v1
+      - uses: julia-actions/julia-processcoverage@v1
+      - uses: codecov/codecov-action@v5
         with:
-          file: lcov.info
+          files: lcov.info
+
   docs:
     name: Documentation
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: julia-actions/setup-julia@v1
         with:
           version: '1'
-      - run: |
-          julia --project=docs -e '
-            using Pkg
-            Pkg.develop(PackageSpec(path=pwd()))
-            Pkg.instantiate()
-            Pkg.build()'
-      - run: julia --project=docs docs/make.jl
+      - uses: julia-actions/cache@v2
+      - uses: julia-actions/julia-docdeploy@v1
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           DOCUMENTER_KEY: ${{ secrets.DOCUMENTER_KEY }}