Adding support for gateway with bun runtime. More tests. Sharing code between drivers and gateway

Dockerfile

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+# https://bun.sh/guides/ecosystem/docker
+# docker build -t sqlitcloud-gateway .
+# docker run -p 8090:8090 -p 4000:4000 --name sqlitecloud-gateway sqlitecloud-gateway       
+
+# use the official Bun image
+# see all versions at https://hub.docker.com/r/oven/bun/tags
+FROM oven/bun:1 as base
+WORKDIR /usr/src/app
+
+# install dependencies into temp directory
+# this will cache them and speed up future builds
+FROM base AS install
+RUN mkdir -p /temp/dev
+COPY package.json bun.lockb /temp/dev/
+RUN cd /temp/dev && bun install --frozen-lockfile
+
+# install with --production (exclude devDependencies)
+RUN mkdir -p /temp/prod
+COPY package.json bun.lockb /temp/prod/
+RUN cd /temp/prod && bun install --frozen-lockfile --production
+
+# copy node_modules from temp directory
+# then copy all (non-ignored) project files into the image
+FROM base AS prerelease
+COPY --from=install /temp/dev/node_modules node_modules
+COPY . .
+
+# [optional] tests & build
+ENV NODE_ENV=production
+#RUN bun test
+#RUN bun run build
+RUN bun build ./src/gateway/gateway.ts --compile --outfile ./sqlitecloud-gateway.out
+
+# copy production dependencies and source code into final image
+FROM base AS release
+COPY --from=install /temp/prod/node_modules node_modules
+COPY --from=prerelease /usr/src/app/src ./src
+COPY --from=prerelease /usr/src/app/public ./public
+COPY --from=prerelease /usr/src/app/package.json .
+COPY --from=prerelease /usr/src/app/sqlitecloud-gateway.out .
+
+# run the app
+USER bun
+
+EXPOSE 4000/tcp
+EXPOSE 8090/tcp
+
+#ENTRYPOINT [ "bun", "run", "./src/gateway/gateway.ts" ]
+ENTRYPOINT [ "./sqlitecloud-gateway.out" ]