Increase obsolete image flagging and pruning

It was observed in the Cirrus-CI cron logs, that only the total
number of images scanned is reported.  Fix this by giving more
useful info., like the number of candidates for obsolete/pruning.

Related, the original restriction of `10` obsolete/prune images
was originally put in place when only a few repos utilized Cirrus-CI
VMs and image building was substantially more infrequent.  The
reason it exists is to prevent potential catastrophe should the `meta`
time stamp updating tasks have a bug or some other related failure occur.
Increase the limit to `50` so deletions may proceed much more rapidly.

*Note:* "Obsolete" images still live w/in a 30-day window where they can
be recovered if need be.  It's simply that any attempted use by CI will
fail, putting someone on notice that image recovery may be necessary.

Signed-off-by: Chris Evich <cevich@redhat.com>

IMG_SFX

@@ -1 +1 @@
-20240702t180702z-f40f39d13
+20240708t135624z-f40f39d13

imgobsolete/entrypoint.sh

@@ -17,7 +17,7 @@ gcloud_init
 
 # Set this to 1 for testing
 DRY_RUN="${DRY_RUN:-0}"
-OBSOLETE_LIMIT=10
+OBSOLETE_LIMIT=50
 THEFUTURE=$(date --date='+1 hour' +%s)
 TOO_OLD_DAYS='30'
 TOO_OLD_DESC="$TOO_OLD_DAYS days ago"
@@ -201,14 +201,15 @@ for (( i=nr_amis ; i ; i-- )); do
 done
 
 COUNT=$(<"$IMGCOUNT")
+CANDIDATES=$(wc -l <$TOOBSOLETE)
 msg "########################################################################"
-msg "Obsoleting $OBSOLETE_LIMIT random images of $COUNT examined:"
+msg "Obsoleting $OBSOLETE_LIMIT random image candidates ($CANDIDATES/$COUNT total):"
 
 # Require a minimum number of images to exist.  Also if there is some
 # horrible scripting accident, this limits the blast-radius.
-if [[ "$COUNT" -lt $OBSOLETE_LIMIT ]]
+if [[ "$CANDIDATES" -lt $OBSOLETE_LIMIT ]]
 then
-    die 0 "Safety-net Insufficient images ($COUNT) to process ($OBSOLETE_LIMIT required)"
+    die 0 "Safety-net Insufficient images ($CANDIDATES) to process ($OBSOLETE_LIMIT required)"
 fi
 
 # Don't let one bad apple ruin the whole bunch

imgprune/entrypoint.sh

@@ -18,7 +18,7 @@ gcloud_init
 # Set this to 1 for testing
 DRY_RUN="${DRY_RUN:-0}"
 # For safety's sake limit nr deletions
-DELETE_LIMIT=10
+DELETE_LIMIT=50
 ABOUTNOW=$(date --iso-8601=date)  # precision is not needed for this use
 # Format Ref: https://cloud.google.com/sdk/gcloud/reference/topic/formats
 # Field list from `gcloud compute images list --limit=1 --format=text`
@@ -106,13 +106,14 @@ for (( i=nr_amis ; i ; i-- )); do
 done
 
 COUNT=$(<"$IMGCOUNT")
+CANDIDATES=$(wc -l <$TODELETE)
 msg "########################################################################"
-msg "Deleting up to $DELETE_LIMIT random images of $COUNT examined:"
+msg "Deleting up to $DELETE_LIMIT random image candidates ($CANDIDATES/$COUNT total)::"
 
 # Require a minimum number of images to exist
-if [[ "$COUNT" -lt $DELETE_LIMIT ]]
+if [[ "$CANDIDATES" -lt $DELETE_LIMIT ]]
 then
-    die 0 "Safety-net Insufficient images ($COUNT) to process deletions ($DELETE_LIMIT required)"
+    die 0 "Safety-net Insufficient images ($CANDIDATES) to process deletions ($DELETE_LIMIT required)"
 fi
 
 sort --random-sort $TODELETE | tail -$DELETE_LIMIT | \