feat(udr): Add GitHub Action

Fix .golangci.yml for gci local-prefix
Add GitHub action for golangci-lint to check coding style.
Accorading to https://github.com/marketplace/actions/run-golangci-lint.

Add GitHub action for go build and go test CI

.github/workflows/go.yml

@@ -0,0 +1,25 @@
+name: Go
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up Go
+      uses: actions/setup-go@v2
+      with:
+        go-version: '1.14.4'
+
+    - name: Build
+      run: go build -v ./...
+
+    - name: Test
+      run: go test -v ./...

.github/workflows/golangci-lint.yml

@@ -0,0 +1,34 @@
+name: golangci-lint
+
+on:
+  push:
+    tags:
+      - v*
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+
+  golangci:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Run golangci-lint
+        uses: golangci/golangci-lint-action@v2
+        with:
+          # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.
+          version: v1.35.0
+
+          # Optional: working directory, useful for monorepos
+          # working-directory: somedir
+
+          # Optional: golangci-lint command line arguments.
+          # args: --issues-exit-code=0
+
+          # Optional: show only new issues if it's a pull request. The default value is `false`.
+          # only-new-issues: true
+
+          # Optional: if set to true then the action will use pre-installed Go
+          # skip-go-installation: true

.golangci.yml

@@ -204,10 +204,32 @@ linters-settings:
     multi-if: false   # Enforces newlines (or comments) after every multi-line if statement
     multi-func: false # Enforces newlines (or comments) after every multi-line function signature
   gci:
-    local-prefixes: "bitbucket.org"
+    local-prefixes: "github.com/free5gc"
   misspell:
     #locale: US
     ignore-words:
+  whitespace:
+    multi-if: false   # Enforces newlines (or comments) after every multi-line if statement
+    multi-func: false # Enforces newlines (or comments) after every multi-line function signature
+  wsl:
+    # If true append is only allowed to be cuddled if appending value is
+    # matching variables, fields or types on line above. Default is true.
+    strict-append: true
+    # Allow calls and assignments to be cuddled as long as the lines have any
+    # matching variables, fields or types. Default is true.
+    allow-assign-and-call: true
+    # Allow multiline assignments to be cuddled. Default is true.
+    allow-multiline-assign: true
+    # Allow declarations (var) to be cuddled.
+    allow-cuddle-declarations: false
+    # Allow trailing comments in ending of blocks
+    allow-trailing-comment: true
+    # Force newlines in end of case at this limit (0 = never).
+    force-case-trailing-whitespace: 0
+    # Force cuddling of err checks with err var assignment
+    force-err-cuddling: false
+    # Allow leading comments to be separated with empty liens
+    allow-separated-leading-comment: false
   custom:
     # Each custom linter should have a unique name.
 
@@ -246,7 +268,7 @@ linters:
     - asciicheck
       #- stylecheck
       # - unparam
-      #- wsl
+      # - wsl
 
   #disable-all: false
   fast: true