master docker build is broken

[morriswinkler]

#16 152.0 Compiling generic-array v0.12.0
#16 152.0 Compiling zip v0.5.4
#16 152.6 error[E0004]: non-exhaustive patterns: _ not covered
#16 152.6 --> /usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/zip-0.5.4/src/cp437.rs:42:24
#16 152.6 |
#16 152.6 42 | let output = match input
#16 152.6 | ^^^^^ pattern _ not covered
#16 152.6
#16 152.6 error: aborting due to previous error
#16 152.6
#16 152.6 For more information about this error, try rustc --explain E0004.
#16 152.6 error: Could not compile zip.
#16 152.6 warning: build failed, waiting for other jobs to finish...
#16 157.6 error: build failed

[morriswinkler]

fix:

# Builder stage
FROM rust:latest as builder