refactor script

Dockerfile

@@ -1,14 +1,16 @@
-FROM alpine:3.17
+FROM alpine:3.18
 
-# Setup correct TZ
-RUN apk add alpine-conf
-RUN /sbin/setup-timezone -z UTC
-
-RUN apk add restic curl
+RUN apk update && apk add --no-cache \
+    bash \
+    curl \
+    restic \
+    postgresql-client \
+    jq
 
 WORKDIR /app
 
-COPY ./src/entry.sh /app/
-COPY ./src/backup.sh /app/
+COPY src/backup.sh /app/backup.sh
 
-CMD [ "/bin/sh", "entry.sh" ]
+RUN chmod +x /app/backup.sh
+
+ENTRYPOINT ["/app/backup.sh"]