refactor: migrate to gitea actions

ci/verify-cache.sh

@@ -0,0 +1,39 @@
+#!/bin/sh
+# Compile in two disposable containers: the second must read the first's cache.
+set -eu
+image=${1:?Usage: verify-cache.sh IMAGE}
+nonce=$(mktemp -d)
+trap 'rmdir "$nonce"' EXIT
+prefix="validation:${image##*:}:$(basename "$nonce"):"
+for expected in miss hit; do
+    docker run --rm -i --network gitea-runner-jobs --cpus 2 \
+        --memory 2g --memory-swap 2g \
+        -e SCCACHE_REDIS_ENDPOINT=redis://openwrt-rust-cache:6379 \
+        -e SCCACHE_REDIS_KEY_PREFIX="$prefix" -e EXPECTED="$expected" \
+        "$image" sh -es <<'PROBE'
+rustc=$(find /builder/staging_dir -type f -path '*/host/bin/rustc')
+test -x "$rustc"
+mkdir /tmp/sccache-probe
+cd /tmp/sccache-probe
+printf 'pub fn probe(n: u64) -> u64 { n.wrapping_mul(17) }\n' > probe.rs
+sccache --start-server
+trap 'sccache --stop-server' EXIT
+sccache --zero-stats
+sccache "$rustc" --crate-name ci_sccache_probe \
+    --crate-type rlib --emit link,dep-info --out-dir . probe.rs
+sccache --show-stats
+sccache --show-stats --stats-format json > stats.json
+python3 - <<'PY'
+import json
+import os
+
+data = json.load(open("stats.json"))
+assert data["cache_location"].startswith("redis,"), data
+stats = data["stats"]
+field = "cache_hits" if os.environ["EXPECTED"] == "hit" else "cache_misses"
+assert sum(stats[field]["counts"].values()) == 1, data
+assert stats["cache_read_errors"] == stats["cache_write_errors"] == 0, data
+print("Verified persistent cache", os.environ["EXPECTED"])
+PY
+PROBE
+done