clear up confusion regarding dockerfiles

Dockerfile.pocketbase

@@ -0,0 +1,26 @@
+FROM alpine:latest
+
+ARG PB_VERSION=0.26.5
+ARG PB_ZIPNAME=pocketbase_${PB_VERSION}_linux_amd64.zip
+
+RUN apk add --no-cache \
+	unzip \
+	ca-certificates
+
+# download and unzip PocketBase
+ADD https://github.com/pocketbase/pocketbase/releases/download/v${PB_VERSION}/${PB_ZIPNAME} /tmp/${PB_ZIPNAME}
+ADD https://github.com/pocketbase/pocketbase/releases/download/v${PB_VERSION}/checksums.txt /tmp/checksums.txt
+WORKDIR /tmp
+RUN grep ${PB_ZIPNAME} checksums.txt | sha256sum -c
+RUN unzip /tmp/${PB_ZIPNAME} -d /pb/
+
+# uncomment to copy the local pb_migrations dir into the image
+# COPY ./pb_migrations /pb/pb_migrations
+
+# uncomment to copy the local pb_hooks dir into the image
+# COPY ./pb_hooks /pb/pb_hooks
+
+EXPOSE 8090
+
+# start PocketBase
+CMD ["/pb/pocketbase", "serve", "--http=0.0.0.0:8090"]