Add docker files.

docker/Dockerfile_issue

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+FROM docker.io/library/debian:latest as builder
+
+RUN apt update && apt install -y golang ca-certificates
+
+COPY . /source
+
+RUN cd /source && go build -o /j7s-gitea-issue cmd/j7s-gitea-issue/main.go
+
+FROM docker.io/library/debian:latest
+RUN apt update && apt install -y ca-certificates
+COPY --from=builder /j7s-gitea-issue /j7s-gitea-issue
+

docker/Dockerfile_listener

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+FROM docker.io/library/debian:latest as builder
+
+RUN apt update && apt install -y golang ca-certificates
+
+COPY . /source
+
+RUN cd /source && go build -o /j7s-gitea-push-listener cmd/j7s-gitea-push-listener/main.go
+
+FROM docker.io/library/debian:latest
+RUN apt update && apt install -y ca-certificates
+COPY --from=builder /j7s-gitea-push-listener /j7s-gitea-push-listener
+

docker/Dockerfile_status

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+FROM docker.io/library/debian:latest as builder
+
+RUN apt update && apt install -y golang ca-certificates
+
+COPY . /source
+
+RUN cd /source && go build -o /j7s-gitea-status cmd/j7s-gitea-status/main.go
+
+FROM docker.io/library/debian:latest
+RUN apt update && apt install -y ca-certificates
+COPY --from=builder /j7s-gitea-status /j7s-gitea-status
+