chore: align source to GOPATH in build environment

This makes module path still work for Go version that does not
support module.

Author: marjune163

.dockerignore

@@ -1,5 +1,6 @@
 *
 !.git
+!go.mod
 !src/
 !build/
 !conf/docker-image

build/build-all-by-docker.sh

@@ -6,6 +6,8 @@ cd $(dirname "$0")
 source ./build-all.inc.sh
 
 prefix=$(realpath ../)
+ghfs=/go/src/mjpclab.dev/ghfs
+
 rm -rf "$prefix/output/"
 
 buildByDocker() {
@@ -15,16 +17,16 @@ buildByDocker() {
 
   docker run \
     --rm \
-    -v "$prefix":/mnt \
+    -v "$prefix":"$ghfs" \
     -e EX_UID="$(id -u)" \
     -e EX_GID="$(id -g)" \
     golang:"$gover" \
     /bin/bash -c '
       sed -i -e "s;://[^/ ]*;://mirrors.aliyun.com;" /etc/apt/sources.list;
       apt-get update;
       apt-get install -yq git zip;
-      /bin/bash /mnt/build/build.sh "$@";
-      chown -R $EX_UID:$EX_GID /mnt/output;
+      /bin/bash '"$ghfs"'/build/build.sh "$@";
+      chown -R $EX_UID:$EX_GID '"$ghfs"'/output;
     ' \
     'argv_0_placeholder' \
     "$@"

build/build-docker-image-dockerfile

@@ -1,8 +1,9 @@
 FROM golang AS builder
-COPY .git/ /mnt/ghfs/.git/
-COPY src/ /mnt/ghfs/src/
-COPY build/ /mnt/ghfs/build/
-RUN ["/bin/bash", "-c", "cd /mnt/ghfs/build/; source ./build.inc.sh; go build -ldflags \"$(getLdFlags)\" -o /tmp/ghfs /mnt/ghfs/src/main.go"]
+COPY .git/ /go/src/mjpclab.dev/ghfs/.git/
+COPY go.mod /go/src/mjpclab.dev/ghfs/go.mod
+COPY src/ /go/src/mjpclab.dev/ghfs/src/
+COPY build/ /go/src/mjpclab.dev/ghfs/build/
+RUN ["/bin/bash", "-c", "cd /go/src/mjpclab.dev/ghfs/build/; source ./build.inc.sh; go build -ldflags \"$(getLdFlags)\" -o /tmp/ghfs /go/src/mjpclab.dev/ghfs/src/main.go"]
 RUN mkdir -p /output/usr/local/bin/; cp /tmp/ghfs /output/usr/local/bin/;
 COPY conf/docker-image/ /output/