Add a Dockerfile for playing with Wasm user-defined functions

The Dockerfile can be used to build a container with precompiled
sqlite3 shell inside, with WebAssembly user-defined function support.

Dockerfile-wasm-udf

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+# This Dockerfile can be used to test the WebAssembly udf build
+# of libSQL.
+# Build with `docker build -t libsql-wasm-udf -f Dockerfile-wasm-udf`
+# Run e.g. with `docker run -it libsql-wasm-udf`
+# or with `docker run -it -v.:/home/libsql/playground libsql-wasm-udf ./sqlite3 playground/db.sql`
+# for an interactive session with the database being preserved on host in the db.sql file.
+
+FROM rust:slim-buster
+
+WORKDIR /home/libsql
+ADD src src
+ADD ext ext
+ADD tool tool
+
+RUN apt-get update
+RUN apt-get install -y tcl8.6-dev build-essential autoconf
+
+#I'm sorry for that
+RUN ln -s /bin/grep /usr/bin/grep
+RUN ln -s /bin/sed /usr/bin/sed
+RUN ln -sf /bin/bash /bin/sh
+
+COPY manifest manifest.uuid VERSION configure.ac Makefile.in \
+    libtool sqlite3.pc.in sqlite_cfg.h.in install-sh config.guess config.sub ltmain.sh .
+
+RUN autoconf
+RUN ./configure --enable-wasm-runtime
+RUN make sqlite3