Collapse build to single stage

.gitlab-ci.yml

 # From: https://about.gitlab.com/2017/09/21/how-to-create-ci-cd-pipeline-with-autodeploy-to-kubernetes-using-gitlab-and-helm/
 
-cache:
-  untracked: true
-  key: "$CI_BUILD_REF_NAME"
-  paths:
-    - vendor/
-
 variables:
   REPO_DIR: gitlab.com/elixxir
   REPO_NAME: notifications-bot
-  DOCKER_IMAGE: golang:1.13.4-buster
+  DOCKER_IMAGE: elixxirlabs/cuda-go:latest
   MIN_CODE_COVERAGE: "0.0"
 
 before_script:
@@ -23,60 +17,39 @@ before_script:
   - chmod 700 ~/.ssh
   - ssh-keyscan -t rsa gitlab.com > ~/.ssh/known_hosts
   - git config --global url."git@gitlab.com:".insteadOf "https://gitlab.com/"
-  - export GOFLAGS=-mod=vendor
+  - export PATH=$HOME/go/bin:$PATH
+  - export GOPRIVATE=gitlab.com/elixxir/*
 
 stages:
-  - setup
-  - test
   - build
-  - tag
   - trigger_integration
 
-setup:
-  stage: setup
+build:
+  stage: build
   image: $DOCKER_IMAGE
   except:
     - tags
   script:
+    - git clean -ffdx
     - go mod vendor -v
     - go build ./...
     - go mod tidy
-  artifacts:
-    paths:
-     - vendor/
-
-test:
-  stage: test
-  image: $DOCKER_IMAGE
-  except:
-    - tags
-  script:
-    - GO111MODULE=off go get -u github.com/haya14busa/goverage
     - apt-get update
     - apt-get install bc -y
 
     - mkdir -p testdata
     # Test coverage
-    - goverage -coverprofile=testdata/coverage-real.out -v ./... 2>&1 | grep -v "no packages being tested depend on"
+    - go-acc --covermode atomic --output testdata/coverage.out ./... -- -v
     # Exclude cmd from test coverage as it is command line related tooling
     # - grep -v -e cmd testdata/coverage.out > testdata/coverage-real.out
-    - go tool cover -func=testdata/coverage-real.out
-    - go tool cover -html=testdata/coverage-real.out -o testdata/coverage.html
+    - go tool cover -func=testdata/coverage.out
+    - go tool cover -html=testdata/coverage.out -o testdata/coverage.html
 
     # Test Coverage Check
-    - go tool cover -func=testdata/coverage-real.out | grep "total:" | awk '{print $3}' | sed 's/\%//g' > testdata/coverage-percentage.txt
+    - go tool cover -func=testdata/coverage.out | grep "total:" | awk '{print $3}' | sed 's/\%//g' > testdata/coverage-percentage.txt
     - export CODE_CHECK=$(echo "$(cat testdata/coverage-percentage.txt) >= $MIN_CODE_COVERAGE" | bc -l)
     - (if [ "$CODE_CHECK" == "1" ]; then echo "Minimum coverage of $MIN_CODE_COVERAGE succeeded"; else echo "Minimum coverage of $MIN_CODE_COVERAGE failed"; exit 1; fi);
-  artifacts:
-    paths:
-      - testdata/
 
-build:
-  stage: build
-  image: $DOCKER_IMAGE
-  except:
-    - tags
-  script:
     - mkdir -p release
     - GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -ldflags '-w -s' ./...
     - GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -ldflags '-w -s' -o release/notifications.linux64 main.go
@@ -85,10 +58,12 @@ build:
     - GOOS=darwin GOARCH=amd64 CGO_ENABLED=0 go build -ldflags '-w -s' -o release/notifications.darwin64 main.go
   artifacts:
     paths:
+      - vendor/
+      - testdata/
       - release/
 
 tag:
-    stage: tag
+    stage: trigger_integration
     only:
         - master
     image: $DOCKER_IMAGE