Configure and document how to have download endpoint working locally

Author: Nemo157

.env.sample

@@ -8,6 +8,7 @@ export DOCSRS_TOOLCHAIN=nightly
 export AWS_ACCESS_KEY_ID=cratesfyi
 export AWS_SECRET_ACCESS_KEY=secret_key
 export S3_ENDPOINT=http://localhost:9000
+export DOCSRS_S3_STATIC_ROOT_PATH=http://localhost:9000/rust-docs-rs
 export DOCSRS_INCLUDE_DEFAULT_TARGETS=false
 export DOCSRS_DOCKER_IMAGE=ghcr.io/rust-lang/crates-build-env/linux-micro
 export SENTRY_ENVIRONMENT=dev

README.md

@@ -69,6 +69,8 @@ docker-compose up -d db s3
 # anything that doesn't run via docker-compose needs the settings defined in
 # .env. Either via `. ./.env` as below, or via any dotenv shell integration.
 . ./.env
+# allow downloads from the s3 container to support the /crate/.../download endpoint
+mcli policy set download docsrs/rust-docs-rs
 # Setup the database you just created
 cargo run -- database migrate
 # Build a sample crate to make sure it works