fix: broken tests (mostly out of stuff being outdated) (#468)

* Update rebar3's releases.json per current results

* Up rebar3 test versions

* Retire windows-2019

* Add "support" to win25-vs2026 next to win25

windows-2025-vs2026 label was previously a beta testing
tag but is now the production default

* Fix rebar3 test releases.json

* Bump per CI results

* Fix per CI results (I checked in releases.json)

* Adapt to Ubuntu 26.04 (no -arm)

* Consider Ubuntu ARM variants in execution

* Typo

* Bump it to the minimum expect value

* Bump it to the minimum expect value

* Tweak ARM tests: drop windows-11

* Fix per prior test results

* Try testing OTP to update README

* Improve guarantees on the README (via tests)

* Improve guarantees on the README (via tests)

Trust tests in intervals (if first Ok and last Ok the middle Ok)

* Add further constraints for testing (per README)

* Remove moving-target test

This is prone to fail for an issue with OTP's main
branch but it shouldn't affect the action, so we
remove it

* Respect Hex's boundaries

* Make it consistent (no need for .0 in versioning)

* Restrict it a bit

We keep the README as-is, since there's nothing preventing us
from thinking it works as stated, but we move our tests forward

* Make it easier to follow

* Fix it per stalled CI

* Fix it: no macos-16; it's macos-26

* Deprecate macos-13

Per https://github.blog/changelog/2025-07-11-upcoming-changes-to-macos-hosted-runners-macos-latest-migration-and-xcode-support-policy-updates/#macos-13-is-closing-down

* Make ImageOS support more explicit

* Move forward

.github/workflows/macos.yml

@@ -16,6 +16,7 @@ on:
 jobs:
   integration_test:
     name: >
+      OS ${{matrix.combo.os}},
       OTP ${{matrix.combo.otp-version}},
       Elixir ${{matrix.combo.elixir-version}},
       rebar3 ${{matrix.combo.rebar3-version}}
@@ -24,6 +25,22 @@ jobs:
       fail-fast: false
       matrix:
         combo:
+          # macOS 14 - per README
+          - otp-version: '25'
+            os: 'macos-14'
+          - otp-version: '29'
+            os: 'macos-14'
+          # macOS 15 - per README
+          - otp-version: '25'
+            os: 'macos-15'
+          - otp-version: '29'
+            os: 'macos-15'
+          # macOS 26 - per README
+          - otp-version: '25'
+            os: 'macos-26'
+          - otp-version: '29'
+            os: 'macos-26'
+          # macOS latest
           - otp-version: '27'
             elixir-version: 'v1.17.0'
             rebar3-version: '3.23'
@@ -43,22 +60,13 @@ jobs:
             elixir-version: '1.14.3'
             os: 'macos-latest'
             version-type: 'strict'
-          - otp-version: '25'
-            os: 'macos-15'
-          - otp-version: '27'
-            elixir-version: '1.18'
-            os: 'macos-26'
-          - otp-version: '26'
-            elixir-version: '1.16'
-            rebar3-version: '3.25'
-            os: 'macos-14'
           - otp-version: '25.0'
-            elixir-version: 'v1.13.4-otp-25'
+            elixir-version: 'v1.16.3-otp-25'
             rebar3-version: '3.18.0'
             os: 'macos-latest'
             version-type: 'strict'
           - otp-version: '25.0'
-            elixir-version: 'v1.13.4'
+            elixir-version: 'v1.16.3'
             rebar3-version: '3.18.0'
             os: 'macos-latest'
             version-type: 'strict'