basic alpine i386 dockerfile

Dockerfile.i386

@@ -0,0 +1,10 @@
+# Convenience tool for testing a 32-bit related security flaw. May be
+# generalized in future to be more useful; until then, it is NOT
+# officially supported but purely a maintainer-facing artifact.
+
+FROM --platform=i386 i386/alpine:3.15
+
+RUN apk add openssl-dev python3-dev libffi-dev make cargo
+
+RUN python3 -m venv env
+RUN env/bin/pip install -U pip