feat: update docker and pipeline

- Add workflow to publish to GHCR
- Add workflow to build Docker image
- Add zap2xmlrc config example
- Update Dockerfile to run continuously

Dockerfile

@@ -0,0 +1,19 @@
+FROM alpine:3.13.5
+
+ENV SLEEPTIME=43200
+
+RUN apk add --no-cache \
+  perl \
+  perl-http-cookies \
+  perl-lwp-useragent-determined \
+  perl-json \
+  perl-json-xs \
+  perl-lwp-protocol-https \
+  perl-gd
+
+WORKDIR /opt
+
+COPY zap2xml.pl zap2xml.pl
+COPY entrypoint.sh entrypoint.sh
+
+ENTRYPOINT ["./entrypoint.sh"]