Added explicit check-cache to address out-of-space

contrib/posix/conf.d/check.conf

@@ -31,7 +31,13 @@ default-command = "check"
 [check.check]
 schedule = "daily"
 schedule-lock-wait = "4h"
-
+#
+# Check cache
+# `check` uses a separate local repo cache to detect problems. The default
+# is to create this cache below "/tmp/". While the daily check (without reading
+# actual data) uses less space cache-dir may require changing when on tmpfs
+cache-dir = "{{.TempDir}}/.restic-temp-check-cache"
+with-cache = true
 
 ##
 # Profile "verify" may be used to schedule deep repository checks
@@ -55,4 +61,11 @@ schedule-lock-wait = "48h"
 read-data = true
 # Read a subset of the repository for verification
 #read-data-subset = "15%"
-
+#
+# Check cache
+# `check` uses a separate local repo cache to detect problems. The built-in
+# default location of this cache is "/tmp/" which can cause issues on tmpfs
+# as the cache may need several GB of storage. Overridding built-in default
+# for the full repo verification check:
+cache-dir = "~/.restic-temp-check-cache"
+with-cache = true