fix: Install supercronic from Alpine repo (#53)

Dockerfile

@@ -2,27 +2,10 @@ FROM python:3.13.0-alpine3.20
 
 WORKDIR /opt/fuelhook
 
-ARG TARGETPLATFORM
-ENV SUPERCRONIC_SHA1SUM_amd64=cd48d45c4b10f3f0bfdd3a57d054cd05ac96812b \
-    SUPERCRONIC_SHA1SUM_arm=75e065bf0909f920b06d5bd797c0e6b31e68b112 \
-    SUPERCRONIC_SHA1SUM_arm64=512f6736450c56555e01b363144c3c9d23abed4c \
-    SUPERCRONIC_SHA1SUM_i386=3436985298ce241d7d9477eb9eab164b582717a8 \
-    SUPERCRONIC_VERSION=v0.2.29
-
-RUN if [ "$TARGETPLATFORM" = "linux/amd64" ]; then ARCH=amd64; elif [ "$TARGETPLATFORM" = "linux/arm/v7" ]; then ARCH=arm; elif [ "$TARGETPLATFORM" = "linux/arm64" ]; then ARCH=arm64; elif [ "$TARGETPLATFORM" = "linux/i386" ]; then ARCH=i386; else exit 1; fi \
-    && export SUPERCRONIC="supercronic-linux-${ARCH}" \
-    && export SUPERCRONIC_URL="https://github.com/aptible/supercronic/releases/download/${SUPERCRONIC_VERSION}/${SUPERCRONIC}" \
-    && wget "$SUPERCRONIC_URL" \
-    && eval SUPERCRONIC_SHA1SUM='$SUPERCRONIC_SHA1SUM_'$ARCH \
-    && echo "${SUPERCRONIC_SHA1SUM}  ${SUPERCRONIC}" | sha1sum -c - \
-    && chmod +x "${SUPERCRONIC}" \
-    && mv "$SUPERCRONIC" "/usr/local/bin/${SUPERCRONIC}" \
-    && ln -s "/usr/local/bin/${SUPERCRONIC}" /usr/local/bin/supercronic \
-    && addgroup -S fuelhook && adduser -S fuelhook -G fuelhook \
+RUN addgroup -S fuelhook && adduser -S fuelhook -G fuelhook \
     && mkdir -p data \
     && chown fuelhook:fuelhook data \
-    && apk --no-cache upgrade \
-    && apk add --no-cache tzdata
+    && apk --no-cache add supercronic tzdata
 
 USER fuelhook