add image build in the ci (intel#21)

Author: togashidm

.github/workflows/ci.yml

@@ -6,6 +6,7 @@ on:
     branches: [ '**' ]
 jobs:
   build:
+    if: github.event_name == 'push'
     runs-on: [self-hosted, linux, x64]
     steps:
     - uses: actions/checkout@v2
@@ -45,19 +46,22 @@ jobs:
     - name: Test race
       run: go test -race ./...
   shellcheck:
+    if: github.event_name == 'push'
     name: Shellcheck
     runs-on: self-hosted
     steps:
       - uses: actions/checkout@v2
       - name: Run ShellCheck
         uses: ludeeus/action-shellcheck@master
   hadolint:
+    if: github.event_name == 'push'
     runs-on: self-hosted
     name: Hadolint
     steps:
       - uses: actions/checkout@v2
       - run: wget -q https://github.com/hadolint/hadolint/releases/download/v2.10.0/hadolint-Linux-x86_64 -O hadolint; chmod +x hadolint ; find . -type f \( -name "Dockerfile*" \) -print0 | xargs -n 1 -0 ./hadolint ;
   gofmt-imports:
+    if: github.event_name == 'push'
     runs-on: self-hosted
     name: Go Fmt and Go Import
     steps:
@@ -71,6 +75,7 @@ jobs:
           gofmt -l .
         shell: bash
   golangci:
+    if: github.event_name == 'push'
     runs-on: self-hosted
     name: lint
     steps:
@@ -85,3 +90,13 @@ jobs:
           # skip-go-installation: true
           # Additional linting tools can be added here
           args: --enable=golint --timeout=5m
+  image:
+    runs-on: self-hosted
+    name: build image
+    if: github.event_name == 'pull_request'
+    steps:
+      - uses: actions/checkout@v2
+      - name: docker
+        run: docker build . -t planner
+      - name: clean image
+        run: docker rmi planner -f