enable CI (still need to do the sysimage rebuilding)

Author: KristofferC

.github/workflows/ci.yml

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+name: CI
+on:
+  pull_request:
+  push:
+    branches:
+      - 'main'
+      - 'release-*'
+    tags: '*'
+concurrency:
+  # Skip intermediate builds: all builds except for builds on the `main` or `release-*` branches
+  # Cancel intermediate builds: only pull request builds
+  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.ref != 'refs/heads/main' || startsWith(github.ref, 'refs/heads/release-') || github.run_number }}
+  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 60
+    strategy:
+      fail-fast: false
+      matrix:
+        julia-version:
+          - 'nightly'
+        os:
+          - ubuntu-latest
+          - windows-latest
+        julia-arch:
+          - x64
+          - x86
+        include:
+          - os: macOS-latest
+            julia-arch: aarch64
+            julia-version: 'nightly'
+          - os: macOS-13
+            julia-arch: x64
+            julia-version: 'nightly'
+    steps:
+      - uses: actions/checkout@v4
+      - uses: julia-actions/setup-julia@v2
+        with:
+          version: ${{ matrix.julia-version }}
+          arch: ${{ matrix.julia-arch }}
+      - 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@v4
+        with:
+          file: lcov.info
+          token: ${{ secrets.CODECOV_TOKEN }}
+  docs:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: julia-actions/setup-julia@v2
+        with:
+          version: 'nightly'
+      - name: Generate docs
+        run: |
+          julia --project --color=yes -e ''
+          julia --project --color=yes -e 'using Pkg; Pkg.respect_sysimage_versions(false); Pkg.activate("docs"); Pkg.develop(PackageSpec(path = pwd()))'
+          julia --project=docs --color=yes docs/make.jl pdf
+        env:
+          DOCUMENTER_KEY: ${{ secrets.DOCUMENTER_KEY }}

.gitignore

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+Manifest.toml
+Manifest-v*.*.toml
+docs/build

docs/Project.toml

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+[deps]
+Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
+LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"

docs/make.jl

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+using LinearAlgebra
+using Documenter: DocMeta, makedocs, deploydocs
+
+DocMeta.setdocmeta!(LinearAlgebra, :DocTestSetup, :(using LinearAlgebra); recursive=true)
+
+makedocs(
+    modules = [LinearAlgebra],
+    sitename = "LinearAlgebra",
+    pages = Any[
+        "LinearAlgebra" => "index.md",
+        ];
+    warnonly = [:missing_docs, :cross_references],
+    )
+
+deploydocs(repo = "github.com/KristofferC/LinearAlgebra.jl.git")