Generic installer fails in Docker container

[voltagex]

=> ERROR [5/5] RUN curl -LSfs https://japaric.github.io/trust/install.sh | sh -s -- --git dflemstr/rq             3.3s
------
 > [5/5] RUN curl -LSfs https://japaric.github.io/trust/install.sh | sh -s -- --git dflemstr/rq:
#0 1.562 install.sh: GitHub repository: https://github.com/dflemstr/rq
#0 1.565 install.sh: Crate: rq
#0 2.105 install.sh: Tag: latest ()
#0 2.557 install.sh: Target: x86_64-unknown-linux-gnu
#0 2.557 install.sh: Installing to: /root/.cargo/bin
#0 3.063
#0 3.063 gzip: stdin: not in gzip format
#0 3.065 tar: Child returned status 1
#0 3.065 tar: Error is not recoverable: exiting now

Investigating further, it's attempting to download https://github.com/dflemstr/rq/releases/download//rq--x86_64-unknown-linux-gnu.tar.gz, which is 404.