Add a justfile for setting up your local machine for tests

I was about to work on a PR to address #2586 and was trying to get my
tests set up so that I could test locally. I found it pretty cumbersome
to copy all of the commands from the ci files in `.github` (maybe
there's a better way? in which case, this isn't necessary), so I threw
them in a `justfile` in case it'd be helpful for others.

justfile

@@ -0,0 +1,11 @@
+setup-for-tests:
+	solana-install init 1.16.0 && \
+	git submodule update --init --recursive --depth 1 && \
+	cd ts/packages/borsh && yarn --frozen-lockfile && yarn build && yarn link --force && cd ../../../ && \
+	cd ts/packages/anchor && yarn --frozen-lockfile && yarn build:node && yarn link && cd ../../../ && \
+	cd ts/packages/spl-associated-token-account && yarn --frozen-lockfile && yarn build:node && yarn link && cd ../../../ && \
+	cd ts/packages/spl-token && yarn --frozen-lockfile && yarn build:node && yarn link && cd ../../../ && \
+	cd examples/tutorial && yarn link @coral-xyz/anchor @coral-xyz/borsh && yarn --frozen-lockfile && cd ../../ && \
+	cd tests && yarn link @coral-xyz/anchor @coral-xyz/borsh @coral-xyz/spl-associated-token-account @coral-xyz/spl-token && yarn --frozen-lockfile && cd .. && \
+	cargo install --path cli anchor-cli --locked --force --debug
+