Improve CI caching and add Zenoh raw driver

.config/nextest.toml

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+[profile.default]
+retries = { backoff = "fixed", count = 2, delay = "500ms" }

.github/cross/Dockerfile.aarch64-unknown-linux-musl-sccache

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+FROM ghcr.io/cross-rs/aarch64-unknown-linux-musl:0.2.5
+ARG DEBIAN_FRONTEND=noninteractive
+
+COPY .github/cross/sccache-prebuilt.sh /sccache.sh
+RUN /sccache.sh x86_64-unknown-linux-musl
+
+COPY .github/cross/cargo-with-stats.sh /usr/local/bin/cargo
+RUN chmod +x /usr/local/bin/cargo
+
+ENV RUSTC_WRAPPER=/usr/bin/sccache
+ENV PATH=/usr/local/bin:/usr/local/cargo/bin:/rust/bin:/usr/bin:/bin

.github/cross/Dockerfile.arm-unknown-linux-musleabihf-sccache

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+FROM ghcr.io/cross-rs/arm-unknown-linux-musleabihf:0.2.5
+ARG DEBIAN_FRONTEND=noninteractive
+
+COPY .github/cross/sccache-prebuilt.sh /sccache.sh
+RUN /sccache.sh x86_64-unknown-linux-musl
+
+COPY .github/cross/cargo-with-stats.sh /usr/local/bin/cargo
+RUN chmod +x /usr/local/bin/cargo
+
+ENV RUSTC_WRAPPER=/usr/bin/sccache
+ENV PATH=/usr/local/bin:/usr/local/cargo/bin:/rust/bin:/usr/bin:/bin

.github/cross/Dockerfile.armv7-unknown-linux-musleabihf-sccache

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+FROM ghcr.io/cross-rs/armv7-unknown-linux-musleabihf:0.2.5
+ARG DEBIAN_FRONTEND=noninteractive
+
+COPY .github/cross/sccache-prebuilt.sh /sccache.sh
+RUN /sccache.sh x86_64-unknown-linux-musl
+
+COPY .github/cross/cargo-with-stats.sh /usr/local/bin/cargo
+RUN chmod +x /usr/local/bin/cargo
+
+ENV RUSTC_WRAPPER=/usr/bin/sccache
+ENV PATH=/usr/local/bin:/usr/local/cargo/bin:/rust/bin:/usr/bin:/bin

.github/cross/Dockerfile.x86_64-unknown-linux-musl-sccache

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+FROM ghcr.io/cross-rs/x86_64-unknown-linux-musl:0.2.5
+ARG DEBIAN_FRONTEND=noninteractive
+
+COPY .github/cross/sccache-prebuilt.sh /sccache.sh
+RUN /sccache.sh x86_64-unknown-linux-musl
+
+COPY .github/cross/cargo-with-stats.sh /usr/local/bin/cargo
+RUN chmod +x /usr/local/bin/cargo
+
+ENV RUSTC_WRAPPER=/usr/bin/sccache
+ENV PATH=/usr/local/bin:/usr/local/cargo/bin:/rust/bin:/usr/bin:/bin

.github/cross/cargo-with-stats.sh

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+#!/bin/sh
+set -e
+
+if [ -x /usr/local/cargo/bin/cargo ]; then
+  real_cargo=/usr/local/cargo/bin/cargo
+elif [ -x /rust/bin/cargo ]; then
+  real_cargo=/rust/bin/cargo
+else
+  echo "cargo wrapper: real cargo not found" >&2
+  exit 1
+fi
+
+if [ "$1" = "build" ]; then
+  "$real_cargo" "$@"
+  /usr/bin/sccache --show-stats --stats-format=json
+else
+  "$real_cargo" "$@"
+fi

.github/cross/report-sccache-stats.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+log_file="${1:-sccache-build.log}"
+stats="$(grep '^{"stats"' "$log_file" | tail -1)"
+if [[ -z "$stats" ]]; then
+  echo "::warning title=sccache stats::No sccache stats found in build log"
+  exit 0
+fi
+
+hits="$(echo "$stats" | jq '[.stats.cache_hits.counts | to_entries[]?.value // 0] | add // 0')"
+misses="$(echo "$stats" | jq '[.stats.cache_misses.counts | to_entries[]?.value // 0] | add // 0')"
+executed="$(echo "$stats" | jq '.stats.requests_executed // 0')"
+compile_requests="$(echo "$stats" | jq '.stats.compile_requests // 0')"
+compilations="$(echo "$stats" | jq '.stats.compilations // 0')"
+not_cacheable="$(echo "$stats" | jq '.stats.requests_not_cacheable // 0')"
+total=$((hits + misses))
+if (( total > 0 )); then
+  rate=$(( hits * 100 / total ))
+else
+  rate=0
+fi
+
+echo "::notice title=sccache stats::${rate}% - ${hits} hits, ${misses} misses, ${executed} executed, ${compilations} compilations, ${compile_requests} requests, ${not_cacheable} not-cacheable"

.github/cross/sccache-prebuilt.sh

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+#!/bin/bash
+set -euxo pipefail
+
+triple="${1:?usage: sccache-prebuilt.sh TRIPLE}"
+url="https://github.com/mozilla/sccache"
+version="${SCCACHE_VERSION:-v0.15.0}"
+
+apt-get update
+apt-get install -y --no-install-recommends ca-certificates curl
+rm -rf /var/lib/apt/lists/*
+
+td="$(mktemp -d)"
+trap 'rm -rf "${td}"' EXIT
+cd "${td}"
+
+curl -LSfs "${url}/releases/download/${version}/sccache-${version}-${triple}.tar.gz" -o sccache.tar.gz
+tar xzf sccache.tar.gz
+install -m 755 "sccache-${version}-${triple}/sccache" /usr/bin/sccache