no Go files in ... when on making golang deb in gitlab-ci/cd

This is something regarding golang, code of which I am using in gitlab-ci.yml file.
This is the error which I am getting no Go files in /builds/release_management as shown:

$ pwd
/builds/release_management
$ echo $BasePathForBinaryFile1
cmd/main_1/
$ ls
COPYING
DebPackageGitLabDocker
README.md
cmd
deb-build
ermbuild
go.mod
publishToRemote.sh
usr
working_gitlab-ci_ableToCreateDebPackageWithNoBinary.yml
$ echo $CI_PROJECT_DIR/$BasePathForBinaryFile1
/builds/release_management/cmd/main_1/
$ GOOS=$GOOS GOARCH=$GOARCH go build -o $BinaryName1 $BasePathForBinaryFile1
no Go files in /builds/release_management
Cleaning up project directory and file based variables
00:00
ERROR: Job failed: exit code 1

Here is the code of my job

variables:
  GOOS: linux
  GOARCH: amd64
  TagName: 1.0.71
  DebFileName: $TagName
  BasePathForBinaryFile1: cmd/main_1/
  BinaryName: main1
  BasePathForBinaryFile2: cmd/main_2/
  BinaryName: main2

build_binary:
  stage: build
  image: golang:latest
  artifacts:
    untracked: true
  script:
    - cd cmd/main_1
    - GOOS=$GOOS GOARCH=$GOARCH go build -o $BinaryName1 $BasePathForBinaryFile1
#    - GOOS=$GOOS GOARCH=$GOARCH go build -o $BinaryName1 $CI_PROJECT_DIR/$BasePathForBinaryFile1

Please note: I have also tried by giving $CI_PROJECT_DIR/$BasePathForBinaryFile1 and that is also not working.

While, this works when I am doing cd first then building it from current using dot(.)

variables:
  GOOS: linux
  GOARCH: amd64
  TagName: 1.0.71
  DebFileName: $TagName
  BasePathForBinaryFile1: cmd/main_1/
  BinaryName: main1
  BasePathForBinaryFile2: cmd/main_2/
  BinaryName: main2

build_binary:
  stage: build
  image: golang:latest
  artifacts:
    untracked: true
  script:
    - cd cmd/main_1
    - GOOS=$GOOS GOARCH=$GOARCH go build -o $BinaryName .

Here is my folder structure:

Any idea what thing should I fix to fix this golang error?

Edit 1: Also, when doing cd $CI_PROJECT_DIR/$BasePathForBinaryFile and then ls it is not going into that directory and still showing content of base directory only:

$ echo $CI_PROJECT_DIR/$BasePathForBinaryFile1
/builds/SugarBox/edge_release_management/cmd/main_1/
$ cd $CI_PROJECT_DIR/$BasePathForBinaryFile
$ ls
COPYING
DebPackageGitLabDocker
README.md
cmd
deb-build
ermbuild
go.mod
publishToRemote.sh
usr
working_gitlab-ci_ableToCreateDebPackageWithNoBinary.yml

There are a few problems:

1. There is no BinaryName1 in your config so

GOOS=$GOOS GOARCH=$GOARCH go build -o $BinaryName1 $BasePathForBinaryFile1

Becomes

GOOS=$GOOS GOARCH=$GOARCH go build -o cmd/main_1/

and the source files are expected in current dir, while they are not there. You need to fix config to have BinaryName1 and BinaryName2 instead of having BinaryName twice.

2. You need to specify src dir as ./cmd/main_1/.
3. In Edit 1 part cd doesn't work because the env name is incorrect it should be $BasePathForBinaryFile1 but it is $BasePathForBinaryFile.