Cirrus: Don't try to cache release project

tools/cirrus_build_project.sh

@@ -32,6 +32,9 @@ else
 fi
 ls ./git_clones
 
+if [[ "$PROJECT" == "release" ]]; then
+    echo "release project is never cached."
+else
     echo "Checking if project is cached..."
     OUTDIR="$(./rbm/rbm showconf $PROJECT output_dir --target $CHANNEL --target ncdns-$OS-$ARCH)"
     OUTFILE="$(./rbm/rbm showconf $PROJECT filename --target $CHANNEL --target ncdns-$OS-$ARCH)"
@@ -41,6 +44,7 @@ if [[ -e "$OUTDIR/$OUTFILE" ]]; then
     else
         echo "Project cache miss, proceeding with build."
     fi
+fi
 
 # VM has 12 GB of free RAM.  Assuming each of the 4 logical cores takes 1 GB
 # during build, that leaves us with 8 GB of unutilized RAM.  Alas, I'm not sure