Do version compare without bc

Dockerfile.alpine

@@ -168,9 +168,9 @@ RUN if [ "${PGTARGET}" -eq 14 ]; then rm -rf /usr/local-pg14 /usr/local-pg15 /us
 RUN if [ "${PGTARGET}" -eq 15 ]; then rm -rf /usr/local-pg15 /usr/local-pg16; fi
 RUN if [ "${PGTARGET}" -eq 16 ]; then rm -rf /usr/local-pg16; fi
 
-# Install locale and bc command for comparisons
+# Install locale
 RUN apk update && \
-  apk add --update bc icu-data-full musl musl-utils musl-locales tzdata && \
+  apk add --update icu-data-full musl musl-utils musl-locales tzdata && \
   apk cache clean
 
 ## FIXME: Only useful while developing this Dockerfile

Dockerfile.bookworm

@@ -166,9 +166,9 @@ RUN if [ "${PGTARGET}" -eq 14 ]; then rm -rf /usr/local-pg14 /usr/local-pg15 /us
 RUN if [ "${PGTARGET}" -eq 15 ]; then rm -rf /usr/local-pg15 /usr/local-pg16; fi
 RUN if [ "${PGTARGET}" -eq 16 ]; then rm -rf /usr/local-pg16; fi
 
-# Install locale and bc command for comparisons
+# Install locale
 RUN apt update && \
-  apt install -y bc icu-devtools locales tzdata && \
+  apt install -y icu-devtools locales tzdata && \
   apt clean
 
 # Pass the PG build target through to the running image

pgautoupgrade-postupgrade.sh

@@ -59,7 +59,7 @@ if [ "x${PGAUTO_REINDEX}" != "xno" ]; then
         echo "Reindexing the databases"
         echo "------------------------"
 
-		if [[ $(echo "15 <= $PGTARGET" | bc) -eq 0 ]]; then
+		if [[ "$PGTARGET" -le 15 ]]; then
 			reindexdb --all --username="${POSTGRES_USER}"
 		else
 			reindexdb --all --concurrently --username="${POSTGRES_USER}"