fix ci: revert to azure-cli image, install nodejs from Alpine 3.21, add do-not-change comment

Agent-Logs-Url: https://github.com/Azure/bicep/sessions/4c027788-deeb-4d6f-bfca-0528f8d38e2f

Co-authored-by: brendandburns <5751682+brendandburns@users.noreply.github.com>

Author: Copilot

.github/workflows/build.yml

@@ -668,10 +668,14 @@ jobs:
 
       - name: Run Bicep E2E Tests (linux-musl-x64)
         if: matrix.runtime.rid == 'linux-musl-x64'
-        uses: docker://node:22-alpine
+        # DO NOT change this image - we use the azure-cli image intentionally to ensure
+        # that Bicep CLI works correctly when installed via Azure CLI. The azure-cli image
+        # is based on Alpine Linux (musl libc) and already includes the ICU libraries
+        # required by the .NET Bicep CLI binary.
+        uses: docker://mcr.microsoft.com/azure-cli:2.63.0
         with:
           entrypoint: sh
-          args: -c "set -eu && apk add --no-cache icu-libs && node -v && npm -v && npm ci --prefix ./src/Bicep.Cli.E2eTests && npm test --prefix ./src/Bicep.Cli.E2eTests"
+          args: -c "set -eu && apk add --no-cache --repository https://dl-cdn.alpinelinux.org/alpine/v3.21/main nodejs npm && node -v && npm -v && npm ci --prefix ./src/Bicep.Cli.E2eTests && npm test --prefix ./src/Bicep.Cli.E2eTests"
         env:
           BICEP_CLI_DOTNET_RID: ${{ matrix.runtime.rid }}
           BICEP_CLI_EXECUTABLE: ../../../Bicep.Cli.E2eTests/src/temp/bicep-cli/bicep