Port Azure Pipelines Android workflow to GitHub Actions

[Copilot]

Migrates .azure/azure-pipelines-android.yml to .github/workflows/android.yml for native GitHub Actions execution.

Changes

• Workflow structure: Converted Azure Pipelines YAML to GitHub Actions format with 4-architecture matrix (ARM, AARCH64, i686, x86_64)
• Dependency builds: Expanded inline 10 CMake template invocations for pcre, libogg, libvorbis, flac, opus, libsndfile, oboe, libinstpatch, fluidsynth, and fluidsynth-assetloader
• Environment setup: Migrated variable setting from ##vso[task.setvariable] to $GITHUB_ENV/$GITHUB_PATH
• Caching: Replaced Cache@2 with actions/cache@v4, added dependency version hashing to cache key
• Artifacts: Replaced PublishBuildArtifacts@1 with actions/upload-artifact@v4
• Permissions: Added explicit contents: read for least-privilege token access

Preserved

• NDK 27.3.13750724, Android API 24
• All 14 dependency compilations (libiconv, libffi, gettext via autotools; glib via meson; remainder via CMake)
• Weekly scheduled builds without caching
• 16KB page alignment verification
• Custom install commands for oboe and fluidsynth-assetloader

Key mappings

# Azure Pipelines → GitHub Actions
$(System.DefaultWorkingDirectory) → ${{ github.workspace }}
$(Build.ArtifactStagingDirectory) → ${{ runner.temp }}/artifacts
condition: → if:
template: cmake-android.yml → inline step with cmake invocation

Original prompt

Port .azure/azure-pipelines-android.yml to a GitHub Action workflow.

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