fix: go panic (#2201)

This was an interesting one!
TODO: add more findings why it works on Mac and not on Linux
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----

> [!IMPORTANT]
> Fixes Go panic by adjusting memory allocation in `InvokeRuntimeCli`
and updates Dockerfile for Linux compatibility.
> 
>   - **Go Panic Fix**:
> - In `exports.go`, `InvokeRuntimeCli` function now allocates an extra
slot in `arg_c_strings` array to prevent out-of-bounds access.
> - Adjusts `defer` block to correctly free only initialized C strings.
>   - **Dockerfile Update**:
> - In `test-package.Dockerfile`, adds `--platform=linux/amd64` to
`FROM` directive to ensure compatibility with Linux.
> - Installs Go 1.22 and protobuf Go plugin for building Go
applications.
> 
> <sup>This description was created by </sup>[<img alt="Ellipsis"
src="https://img.shields.io/badge/Ellipsis-blue?color=175173">](https://www.ellipsis.dev?ref=BoundaryML%2Fbaml&utm_source=github&utm_medium=referral)<sup>
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Author: ba11b0y

engine/language_client_go/baml_go/exports.go

@@ -42,13 +42,14 @@ func BamlVersion() string {
 }
 
 func InvokeRuntimeCli(args []string) (int, error) {
-	arg_c_strings := make([]*C.char, len(args))
+	arg_c_strings := make([]*C.char, len(args)+1)
 	for i, arg := range args {
 		arg_c_strings[i] = C.CString(arg)
 	}
+	
 	defer func() {
-		for _, arg_c_string := range arg_c_strings {
-			C.free(unsafe.Pointer(arg_c_string))
+		for i := 0; i < len(args); i++ {
+			C.free(unsafe.Pointer(arg_c_strings[i]))
 		}
 	}()
 

integ-tests/python/docker-tests/test-package.Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.12
+FROM --platform=linux/amd64 python:3.12
 
 WORKDIR /app
 
@@ -31,6 +31,19 @@ SHELL ["/bin/bash", "-c"]
 RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
 ENV PATH="/root/.cargo/bin:${PATH}"
 
+# Install Go 1.22
+RUN curl -L https://go.dev/dl/go1.22.10.linux-amd64.tar.gz -o go1.22.10.linux-amd64.tar.gz && \
+    rm -rf /usr/local/go && \
+    tar -C /usr/local -xzf go1.22.10.linux-amd64.tar.gz && \
+    rm go1.22.10.linux-amd64.tar.gz
+
+ENV PATH="/usr/local/go/bin:${PATH}"
+ENV GOPATH="/root/go"
+ENV PATH="${GOPATH}/bin:${PATH}"
+
+# Install protobuf Go plugin
+RUN go install google.golang.org/protobuf/cmd/protoc-gen-go@latest
+
 # Install uv properly
 ADD https://astral.sh/uv/install.sh /uv-installer.sh