The hash algorithm used for the APKINDEX name in the cache was changed
from sha1 to sha256 in [8c7100a61804]. Switching back to sha1 allows
the cache to be shared without invalidating the cache.

[8c7100a61804] db, blob: remove direct usage of openssl and use the abstraction

Ref https://gitlab.alpinelinux.org/alpine/apk-tools/-/merge_requests/328

--- a/src/app_upgrade.c
+++ b/src/app_upgrade.c
@@ -19,7 +19,7 @@
 // APK_PREUPGRADE_TOKEN is used to determine if APK version changed
 // so much after self-upgrade that a repository autoupdate should be
 // enabled. Mainly needed if the index cache name changes.
-#define APK_PREUPGRADE_TOKEN	"laiNgeiThu6ip1Te"
+#define APK_PREUPGRADE_TOKEN	"laiNgeiThu6ip1Tf"
 
 struct upgrade_ctx {
 	unsigned short solver_flags;
--- a/src/database.c
+++ b/src/database.c
@@ -1588,7 +1588,7 @@ static int add_repository_component(struct apk_repoparser *rp, apk_blob_t url, c
 		.tag_mask = BIT(tag_id),
 		.v2_allowed = !apk_blob_ends_with(url_index, APK_BLOB_STRLIT(".adb")),
 	};
-	apk_digest_calc(&repo->hash, APK_DIGEST_SHA256, url_index.ptr, url_index.len);
+	apk_digest_calc(&repo->hash, APK_DIGEST_SHA1, url_index.ptr, url_index.len);
 	if (is_index_stale(db, repo)) repo->stale = 1;
 	return 0;
 }