Alan-Jowett / sonde / 25570687062
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fix: build Azure handler in Alpine container for static musl linkage (#868)

* fix: build Azure handler in Alpine container for static musl linkage

The handler binary was dynamically linked against glibc 2.39 (from the
ubuntu-latest CI runner), but the Azure Functions Linux Consumption
runtime ships an older glibc, causing the process to crash on startup
with `GLIBC_2.39 not found`.

Build the handler inside an Alpine Docker container (matching the
pattern used by sonde-azure-companion) so the binary is statically
linked against musl with openssl-libs-static. This eliminates all
host glibc version dependencies.

Changes:
- Add `Dockerfile.azure-handler-builder` (multi-stage: build in
  rust:alpine, export only the zip artifact via scratch stage)
- Add `.dockerignore` for the builder to exclude target/, docs, etc.
- Simplify `build-function-package.sh` to delegate to `docker build -o`
- Replace Rust/protoc CI steps with Docker Buildx setup

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* fix: use docker buildx build and pin platform to linux/amd64

Address review feedback: use `docker buildx build` instead of plain
`docker build` so BuildKit output export works regardless of the host
Docker configuration. Pin `--platform linux/amd64` so the binary
matches the Azure Functions x86_64 runtime even when built on ARM hosts.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Alan Jowett <alan.jowett@microsoft.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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1 25570687062.1 124
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