Fix CI cache version number (#392)

The first weeks of the year have a leading zero (e.g. 09), so bash was interpreting it as octal-base. This is fixed with the '#10' prefix.

Removed the `cache-keys` id as it's not used in `fuzz.yml`.

.github/workflows/fuzz.yml

@@ -29,10 +29,11 @@ jobs:
 
       # Calculate cache keys
       - name: Generate cache keys
-        id: cache-keys
         run: |
           YEAR=$(date +%Y)
-          BIWEEK=$(( ($(date +%U) + 1) / 2 ))
+          WEEK=$(date +%U)
+          # Use '10#' to always treat week number as base-10 (avoids octal when number has a leading zero)
+          BIWEEK=$(( (10#$WEEK + 1) / 2 ))
           echo "CACHE_VERSION=${YEAR}(${BIWEEK})" >> $GITHUB_ENV
           
           # Hash of all files that could affect the build

.github/workflows/rust.yml

@@ -41,9 +41,11 @@ jobs:
 
       # Bi-weekly numbers to refresh caches every two weeks, ensuring recent project changes are cached
       - name: Set bi-weekly cache key
+        # Use '10#' to always treat week number as base-10 (avoids octal when number has a leading zero)
         run: |
           YEAR=$(date +%Y)
-          BIWEEK=$(( ($(date +%U) + 1) / 2 ))
+          WEEK=$(date +%U)
+          BIWEEK=$(( (10#$WEEK + 1) / 2 ))
           echo "CACHE_VERSION=${YEAR}(${BIWEEK})" >> $GITHUB_ENV
         shell: bash