feat(ci): use custom builder image

.woodpecker/lint.yml

@@ -9,4 +9,5 @@ steps:
   lint:
     image: 'git.rustybever.be/chewing_bever/rieter-builder:1.79-alpine3.19'
     commands:
+      - rustup component add rustfmt
       - cargo fmt -- --check

build.Dockerfile

@@ -1,10 +1,7 @@
-# Command to build and push builder image (change tags as necessary):
-# docker buildx build -f build.Dockerfile -t git.rustybever.be/chewing_bever/rieter-builder:1.79-alpine3.19 --platform linux/amd64,linux/arm64 --push .
 FROM rust:1.79-alpine3.19
 
 # Dependencies required to statically compile libarchive and libsqlite3
 RUN apk add --no-cache \
-        build-base \
         libarchive-static libarchive-dev \
         zlib-static \
         openssl-libs-static \