add containerized release build

.dockerignore

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+*

Dockerfile

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+FROM docker.io/library/alpine:edge
+RUN apk add --no-cache \
+  bash tree rustup git just cloc build-base clang20-dev \
+  pipewire-jack-dev lilv-dev serd-dev
+RUN adduser -Du1000 build
+USER 1000
+RUN rustup-init -y
+RUN source "$HOME/.cargo/env" \
+ && rustup install nightly \
+ && rustup default nightly \
+ && cargo version -vv

release.sh

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+#!/usr/bin/env sh
+set -exo pipefail
+docker build --cache-from=internal -t tek .
+docker run -itu0 -v .:/build -vtek-build-target:/build/target -w/build tek