Use regex to capture pocketbase version

Dockerfile

@@ -1,9 +1,11 @@
-FROM alpine:3.19 AS downloader
+FROM alpine:3.19.1 AS downloader
+
+# renovate: datasource=github-releases depName=pocketbase/pocketbase extractVersion=^v(?<version>.*)$
+ARG VERSION=0.22.10
 
 ARG TARGETOS
 ARG TARGETARCH
 ARG TARGETVARIANT
-ARG VERSION=0.22.10
 
 ENV BUILDX_ARCH="${TARGETOS:-linux}_${TARGETARCH:-amd64}${TARGETVARIANT}"
 
@@ -11,7 +13,7 @@ ENV BUILDX_ARCH="${TARGETOS:-linux}_${TARGETARCH:-amd64}${TARGETVARIANT}"
 ADD https://github.com/pocketbase/pocketbase/releases/download/v${VERSION}/pocketbase_${VERSION}_${BUILDX_ARCH}.zip /tmp/pb.zip
 RUN unzip /tmp/pb.zip -d /pb/
 
-FROM alpine:3.19
+FROM alpine:3.19.1
 RUN apk update && apk add ca-certificates && rm -rf /var/cache/apk/*
 
 EXPOSE 8090