feat: re-enable OTP 28 with updated versions

- OTP 28.3.1 (latest stable, Jan 2026)
- Elixir 1.19.5 (proper OTP 28.1+ support)

Keeps OTP 27.3.4.2 as secondary build target for compatibility.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: Adrian Ibañez

.github/config/erlixir-versions.json

@@ -1,6 +1,15 @@
 {
-  "_comment": "OTP 28 temporarily disabled - Hex package manager not yet compatible",
   "erlixir": [
+    {
+      "otp-version": "28.3.1",
+      "elixir-version": "1.19.5",
+      "erl-opts-description": "somemods",
+      "erl-opts": "--disable-debugger --disable-year2038 --disable-megaco-flex-scanner-lineno --disable-megaco-reentrant-flex-scanner --without-javac --without-odbc --without-wx --disable-megaco --disable-corba",
+      "erl-disable-applications": "",
+      "use-git": false,
+      "git-repo": "erlang/otp",
+      "git-ref": "OTP-28.3.1"
+    },
     {
       "otp-version": "27.3.4.2",
       "elixir-version": "1.18.2",

.github/workflows/Android-Matrix.yml

@@ -179,8 +179,8 @@ jobs:
     env:
       ARCH_IDENTIFIER: ${{ matrix.platform.arch_id }}-${{ matrix.platform.android_name }}-${{ matrix.platform.abi }}
       # Required by generate_beam_dockerfile even for NIF builds (must match an OTP version from erlixir-versions.json)
-      OTP_VERSION: '27.3.4.2'
-      OTP_TAG: OTP-27.3.4.2
+      OTP_VERSION: '28.3.1'
+      OTP_TAG: OTP-28.3.1
 
     steps:
       - name: Checkout code
@@ -189,8 +189,8 @@ jobs:
       - name: Setup Elixir
         uses: erlef/setup-beam@v1
         with:
-          otp-version: 27.3.4.2
-          elixir-version: 1.18.2
+          otp-version: 28.3.1
+          elixir-version: 1.19.5
 
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v3
@@ -201,14 +201,14 @@ jobs:
 
       - name: Pull BEAM Docker image
         run: |
+          docker pull ghcr.io/${{ github.repository_owner }}/android_beam:arch_${{ env.ARCH_IDENTIFIER }}-28.3.1 || \
           docker pull ghcr.io/${{ github.repository_owner }}/android_beam:arch_${{ env.ARCH_IDENTIFIER }}-27.3.4.2 || \
-          docker pull ghcr.io/${{ github.repository_owner }}/android_beam:arch_${{ env.ARCH_IDENTIFIER }}-28.0.2 || \
           echo "Warning: Could not pull BEAM image, NIF build may fail"
 
       - name: Build NIF ${{ matrix.nif.name }}
         env:
           ARCH: ${{ matrix.platform.arch_id }}
-          BASE_IMAGE: ghcr.io/${{ github.repository_owner }}/android_beam:arch_${{ env.ARCH_IDENTIFIER }}-27.3.4.2
+          BASE_IMAGE: ghcr.io/${{ github.repository_owner }}/android_beam:arch_${{ env.ARCH_IDENTIFIER }}-28.3.1
         run: |
           mix local.hex --force --if-missing
           mix local.rebar --force --if-missing