cicd: Dockerfile and entry script

Dockerfile

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+FROM alpine:3.18.4@sha256:eece025e432126ce23f223450a0326fbebde39cdf496a85d8c016293fc851978
+
+RUN apk add --update --no-cache \
+    ca-certificates \
+    curl \
+    jq \
+    supercronic \
+    tzdata \
+    && rm -rf /var/cache/apk/* /.cache
+
+COPY --chmod=500 entry.sh /entry.sh
+COPY --chmod=500 unlock.sh /usr/local/bin/unlock
+
+CMD ["/entry.sh"]

entry.sh

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+#!/bin/sh
+
+if [ -n "$CRONTAB" ]; then
+  echo "$CRONTAB" > /crontab.txt
+else
+  echo "Error: Missing 'CRONTAB' environment variable"
+  exit 1
+fi
+
+# Test crontab
+echo "Testing crontab.txt"
+supercronic -test -debug /crontab.txt || exit 1
+
+# Start supercronic
+supercronic -passthrough-logs /crontab.txt