Copy tls ca cert on build and use docker for test

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.21rc3-alpine3.18
+FROM golang:1.21rc3-alpine3.18 as base
 WORKDIR /app
 
 COPY go.mod go.sum ./
@@ -7,10 +7,21 @@ RUN go mod download && go mod verify
 COPY cau_parser ./cau_parser
 COPY server ./server
 
-COPY *.go ./
-RUN go build -v -o ./app ./
+# To avoid tls error from swedu.cau.ac.kr
+COPY swedu-cert.pem /usr/local/share/ca-certificates/swedu-cert.crt
+RUN cat /usr/local/share/ca-certificates/swedu-cert.crt >> /etc/ssl/certs/ca-certificates.crt
 
 COPY static ./static
 COPY html ./html
 
-CMD ["/app/app"]
+COPY *.go ./
+
+FROM base as build
+RUN go build -v -o ./app ./
+
+FROM build as test
+# To check whether build is done without error, testing is performed after build stage
+RUN ["go", "test" ,"-v", "./..."]
+
+FROM build as deployment
+CMD ["/app/app"]

swedu-cert.pem

@@ -0,0 +1,86 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----