ci(payment-link): add Dockerfile for payment link wasm builds (#10421)

docker/payment-link-wasm-build.Dockerfile

@@ -0,0 +1,36 @@
+FROM rust:latest as builder
+
+ARG FEATURES=""
+ARG VERSION_FEATURE_SET="v1"
+ARG ENVIRONMENT="development"
+
+RUN apt-get update \
+    && apt-get install -y clang libssl-dev pkg-config
+
+ENV CARGO_INCREMENTAL=0
+# Allow more retries for network requests in cargo (downloading crates) and
+# rustup (installing toolchains). This should help to reduce flaky CI failures
+# from transient network timeouts or other issues.
+ENV CARGO_NET_RETRY=10
+ENV RUSTUP_MAX_RETRIES=10
+# Don't emit giant backtraces in the CI logs.
+ENV RUST_BACKTRACE="short"
+# Set ENVIRONMENT for build.rs to read SDK URL from config/sdk_urls.toml
+ENV ENVIRONMENT=${ENVIRONMENT}
+
+COPY . .
+
+RUN cargo install wasm-pack
+
+# Build payment_link WASM with ENVIRONMENT variable set
+# This allows build.rs to select the correct SDK URL from config/sdk_urls.toml
+RUN ENVIRONMENT=${ENVIRONMENT} wasm-pack build \
+    --target web \
+    --out-dir /tmp/wasm \
+    --out-name payment_link \
+    crates/payment_link \
+    -- --features wasm,${VERSION_FEATURE_SET},${FEATURES}
+
+FROM scratch
+
+COPY --from=builder /tmp/wasm /tmp