Expand advanced documentation

docs/adrs/0001-architecture.md

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+## Architecture
+
+You can use any of the [supported operating systems](https://docs.github.com/en/actions/reference/virtual-environments-for-github-hosted-runners), and the compatible `architecture` can be selected using `architecture`. Values are `x86`, `x64`, `arm`, `arm64`, `amd64` (not all of the architectures are available on all platforms).
+
+```yaml
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    name: Go sample
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-go@v3
+        with:
+          go-version: '18'
+          architecture: 'amd64' # optional, x64 or x86. If not specified, x64 will be used by default
+```