Run CI also on oldest compatible Julia version and update GH actions

.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: "monthly"

.github/workflows/CI.yml

@@ -0,0 +1,36 @@
+name: CI
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  test:
+    name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        version:
+          - "1.6"
+          - "1"
+        os:
+          - ubuntu-latest
+          - macOS-latest
+          - windows-latest
+        arch:
+          - x64
+    steps:
+      - uses: actions/checkout@v4
+      - uses: julia-actions/setup-julia@v1
+        with:
+          version: ${{ matrix.version }}
+          arch: ${{ matrix.arch }}
+      - uses: julia-actions/cache@v1
+      - uses: julia-actions/julia-buildpkg@v1
+      - uses: julia-actions/julia-runtest@v1
+      - uses: julia-actions/julia-processcoverage@v1
+      - uses: codecov/codecov-action@v4
+        with:
+          fail_ci_if_error: true
+          files: lcov.info
+          token: ${{ secrets.CODECOV_TOKEN }}

.github/workflows/main.yml → .github/workflows/Docs.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: julia-actions/setup-julia@latest
+      - uses: julia-actions/setup-julia@v1
         with:
           version: '1'
       - name: Install dependencies

.github/workflows/JuliaNightly.yml

@@ -0,0 +1,35 @@
+name: JuliaNightly
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  test:
+    name: ${{ matrix.os }} - ${{ matrix.arch }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        version:
+          - "nightly"
+        os:
+          - ubuntu-latest
+          - macOS-latest
+          - windows-latest
+        arch:
+          - x64
+    steps:
+      - uses: actions/checkout@v4
+      - uses: julia-actions/setup-julia@v1
+        with:
+          version: ${{ matrix.version }}
+          arch: ${{ matrix.arch }}
+      - uses: julia-actions/cache@v1
+      - uses: julia-actions/julia-buildpkg@v1
+      - uses: julia-actions/julia-runtest@v1
+      - uses: julia-actions/julia-processcoverage@v1
+      - uses: codecov/codecov-action@v4
+        with:
+          fail_ci_if_error: true
+          files: lcov.info
+          token: ${{ secrets.CODECOV_TOKEN }}

README.md

@@ -2,9 +2,7 @@
 
 [![](https://img.shields.io/badge/docs-stable-blue.svg)](https://julianlsolvers.github.io/Optim.jl/stable)
 [![](https://img.shields.io/badge/docs-latest-blue.svg)](https://julianlsolvers.github.io/Optim.jl/dev)
-[![Build Status](https://github.com/JuliaNLSolvers/Optim.jl/actions/workflows/windows.yml/badge.svg)](https://github.com/JuliaNLSolvers/Optim.jl/actions/workflows/windows.yml)
-[![Build Status](https://github.com/JuliaNLSolvers/Optim.jl/actions/workflows/linux.yml/badge.svg)](https://github.com/JuliaNLSolvers/Optim.jl/actions/workflows/linux.yml)
-[![Build Status](https://github.com/JuliaNLSolvers/Optim.jl/actions/workflows/mac.yml/badge.svg)](https://github.com/JuliaNLSolvers/Optim.jl/actions/workflows/mac.yml)
+[![Build Status](https://github.com/JuliaNLSolvers/Optim.jl/actions/workflows/CI.yml/badge.svg?branch=master)](https://github.com/JuliaNLSolvers/Optim.jl/actions/workflows/CI.yml?query=branch%3Amaster)
 [![Codecov branch](https://img.shields.io/codecov/c/github/JuliaNLSolvers/Optim.jl/master.svg)](https://codecov.io/gh/JuliaNLSolvers/Optim.jl)
 [![JOSS](http://joss.theoj.org/papers/10.21105/joss.00615/status.svg)](https://doi.org/10.21105/joss.00615)