feat(packaging): honour CARGO_TARGET_DIR + document distrobox build
build-appimage.sh now reads the binary from CARGO_TARGET_DIR when set, so a broad-compat build inside an old-glibc distrobox can use an isolated target dir without clobbering the host's. README documents the Ubuntu 24.04 distrobox recipe and why older bases don't work (the pipewire crate needs PW >= ~1.0 headers; and a PipeWire/portal app can't run on ancient distros anyway). Resulting baseline: glibc 2.39 (the only 2.39 symbols are weak pidfd refs from Rust std; everything else is <= 2.35). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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@@ -25,7 +25,9 @@ export VERSION
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echo ">> building release binary (--features gui)"
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( cd "$repo" && cargo build --release --features gui )
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bin="$repo/target/release/pixelpass"
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# Honour CARGO_TARGET_DIR so an isolated build (e.g. inside an old-glibc
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# distrobox) doesn't have to clobber the host's target/.
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bin="${CARGO_TARGET_DIR:-$repo/target}/release/pixelpass"
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echo ">> fetching linuxdeploy"
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ld="$tools/linuxdeploy-x86_64.AppImage"
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