feat: add macOS-26 to supported ImageOS mappings (#430)

Add macos26 to the ImageOSToContainer map so runners using
macOS-26 are recognized instead of throwing an error.

Update macos.yml

Update README.md

Author: petermm

.github/workflows/macos.yml

@@ -45,6 +45,9 @@ jobs:
             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'

README.md

@@ -88,6 +88,7 @@ and Erlang/OTP.
 | `macOS-13`       | 25.0 - 28    | x86_64, arm64    | ✅
 | `macOS-14`       | 25.0 - 28    | x86_64, arm64    | ✅
 | `macOS-15`       | 25.0 - 28    | x86_64, arm64    | ✅
+| `macOS-26`       | 25.0 - 28    | x86_64, arm64    | ✅
 
 **Note** \*: prior to 23, Windows builds are only available for minor versions, e.g. 21.0, 21.3,
 22.0, etc.
@@ -107,6 +108,7 @@ uses that to download assets:
 | `macos13`          | `macOS-13`
 | `macos14`          | `macOS-14`
 | `macos15`          | `macOS-15`
+| `macos26`          | `macOS-26`
 
 as per the following example:
 

dist/index.js

@@ -58172,6 +58172,7 @@ function getRunnerOSVersion() {
     macos13: 'macOS-13',
     macos14: 'macOS-14',
     macos15: 'macOS-15',
+    macos26: 'macOS-26',
   }
   const deprecatedImageOSToContainer = {
     ubuntu18: 'ubuntu-18.04',

src/setup-beam.js

@@ -665,6 +665,7 @@ function getRunnerOSVersion() {
     macos13: 'macOS-13',
     macos14: 'macOS-14',
     macos15: 'macOS-15',
+    macos26: 'macOS-26',
   }
   const deprecatedImageOSToContainer = {
     ubuntu18: 'ubuntu-18.04',