Updated release workflow

Signed-off-by: Alexander Lyall <alex@adcm.uk>

.gitea/workflows/release.yaml

@@ -93,11 +93,12 @@ jobs:
           set -e
 
           PREV_TAG="$(
-            git tag --list 'v*' \
-              | grep -E '^v[0-9]{2}\.[0-9]{2}\.[0-9]{2}[a-z]$' \
+            git for-each-ref \
+              --sort=-creatordate \
+              --format='%(refname:short)' \
+              refs/tags \
               | grep -Fxv "$TAG" \
-              | sort -V \
-              | tail -n 1 \
+              | head -n 1 \
               || true
           )"