feat(ci): build docker image

.ci/check-gofmt

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+result="$(gofmt -s -l . | grep -v '^vendor/' )"
+if [ -n "$result" ]; then
+  echo "Go code is not formatted, run 'gofmt -s -w .'" >&2
+  echo "$result"
+  exit 1
+fi
+

.ci/check-testfiles

@@ -0,0 +1,26 @@
+#!/usr/bin/env python3
+# checks if every desired package has test files
+
+import os
+import re
+import sys
+
+source_re = re.compile(".*\.go")
+test_re   = re.compile(".*_test\.go")
+missing   = False
+
+for root, dirs, files in os.walk("."):
+  # ignore some paths
+  if root == "." or root.startswith("./vendor") or root.startswith("./.") or root.startswith("./docs"):
+    continue
+
+  # source files but not test files?
+  if len([f for f in files if source_re.match(f)]) > 0 and len([f for f in files if test_re.match(f)]) == 0:
+    print("no test files for {}".format(root))
+    missing = True
+
+if missing:
+  sys.exit(1)
+else:
+  print("every package has test files")
+

.gitlab-ci.yml

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+image: "golang:latest"
+
+variables:
+  DOCKER_IMAGE_TAG: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG
+  # Tell 'docker:dind' to enable TLS (recommended)
+  # and generate certificates in the specified directory.
+  DOCKER_TLS_CERTDIR: "/certs"
+
+stages:
+  - test
+  - build
+
+test-lint:
+  stage: test
+  script:
+    - go install github.com/client9/misspell/cmd/misspell@latest
+    - find . -type f -not -path "./webroot/assets" | grep -v "models/.*_testdata.*.go" | xargs misspell -error
+    - ./.ci/check-gofmt
+    - ./.ci/check-testfiles
+
+build-linux:
+  stage: build
+  except:
+    - tags
+    - master
+    - main
+  script:
+    # build app with version
+    - go install
+    - mv "/go/bin/$CI_PROJECT_NAME" "$CI_PROJECT_DIR/$CI_PROJECT_NAME"
+  artifacts:
+    paths:
+      - config_example.toml
+      - "$CI_PROJECT_NAME"
+
+build-docker:
+  stage: build
+  image: docker:latest
+  services:
+    - docker:dind
+  script:
+    - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
+    - docker build -t $DOCKER_IMAGE_TAG --build-arg VERSION=$CI_COMMIT_REF_SLUG .
+    - docker push $DOCKER_IMAGE_TAG
+
+build-release:
+  stage: build
+  only:
+    - tags
+  script:
+    # build app with version
+    - go install
+    - mv "/go/bin/$CI_PROJECT_NAME" "$CI_PROJECT_DIR/$CI_PROJECT_NAME"
+  artifacts:
+    paths:
+      - config_example.toml
+      - "$CI_PROJECT_NAME"
+    expire_in: never

Dockerfile

@@ -0,0 +1,21 @@
+##
+# Compile application
+##
+FROM golang:latest AS build-env
+WORKDIR /app
+COPY . .
+# ge dependencies
+RUN go mod tidy
+# build binary
+RUN CGO_ENABLED=0 go build -ldflags="-w -s" -o oven-exporter
+
+
+##
+# Build Image
+##
+FROM scratch
+COPY --from=build-env /app/oven-exporter /oven-exporter
+COPY --from=build-env /app/config_example.toml /config.toml
+
+WORKDIR /
+ENTRYPOINT ["/server"]

api/client_test.go

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+package api