Fix .env.sample so it actually puts variables in the environment when sourced

Author: notriddle

.env.sample

@@ -1,9 +1,9 @@
-DOCSRS_PREFIX=ignored/cratesfyi-prefix
-DOCSRS_DATABASE_URL=postgresql://cratesfyi:password@localhost:15432
-DOCSRS_LOG=docs_rs=debug,rustwide=info
-AWS_ACCESS_KEY_ID=cratesfyi
-AWS_SECRET_ACCESS_KEY=secret_key
-S3_ENDPOINT=http://localhost:9000
-DOCSRS_INCLUDE_DEFAULT_TARGETS=false
-DOCSRS_DOCKER_IMAGE=ghcr.io/rust-lang/crates-build-env/linux-micro
-SENTRY_ENVIRONMENT=dev
+export DOCSRS_PREFIX=ignored/cratesfyi-prefix
+export DOCSRS_DATABASE_URL=postgresql://cratesfyi:password@localhost:15432
+export DOCSRS_LOG=docs_rs=debug,rustwide=info
+export AWS_ACCESS_KEY_ID=cratesfyi
+export AWS_SECRET_ACCESS_KEY=secret_key
+export S3_ENDPOINT=http://localhost:9000
+export DOCSRS_INCLUDE_DEFAULT_TARGETS=false
+export DOCSRS_DOCKER_IMAGE=ghcr.io/rust-lang/crates-build-env/linux-micro
+export SENTRY_ENVIRONMENT=dev