Add Go 1.15 to the supported version and phase out the Go 1.12

Also updated the release automation to release gosec with use Go 1.15

Signed-off-by: Cosmin Cojocar <ccojocar@cloudbees.com>

.github/workflows/ci.yml

@@ -7,6 +7,17 @@ on:
     branches:
       - master
 jobs:
+  tests-go-1-15:
+    runs-on: ubuntu-latest
+    env:
+      GO111MODULE: on
+    steps:
+      - name: Checkout Source 
+        uses: actions/checkout@v2
+      - name: Run Tests
+        uses: cedrickring/golang-action/go1.15@1.5.1
+        with:
+          args: make test
   tests-go-1-14:
     runs-on: ubuntu-latest
     env:
@@ -15,7 +26,7 @@ jobs:
       - name: Checkout Source 
         uses: actions/checkout@v2
       - name: Run Tests
-        uses: cedrickring/golang-action@1.5.1
+        uses: cedrickring/golang-action/go1.14@1.5.1
         with:
           args: make test
   tests-go-1-13:
@@ -29,19 +40,8 @@ jobs:
         uses: cedrickring/golang-action/go1.13@1.5.1
         with:
           args: make test
-  tests-go-1-12:
-    runs-on: ubuntu-latest
-    env:
-      GO111MODULE: on
-    steps:
-      - name: Checkout Source 
-        uses: actions/checkout@v2
-      - name: Run Tests
-        uses: cedrickring/golang-action/go1.12@1.5.1
-        with:
-          args: make test
   coverage:
-    needs: [tests-go-1-14, tests-go-1-13, tests-go-1-12]
+    needs: [tests-go-1-15, tests-go-1-14, tests-go-1-13]
     runs-on: ubuntu-latest
     env:
       GO111MODULE: on

.github/workflows/release.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v1
         with:
-          go-version: 1.14.x
+          go-version: 1.15.x
       - name : Get release version
         id: get_version
         run: echo ::set-env name=RELEASE_VERSION::$(echo ${GITHUB_REF:10})
@@ -33,6 +33,6 @@ jobs:
             name: securego/gosec
             username: ${{ secrets.DOCKER_USERNAME }}
             password: ${{ secrets.DOCKER_PASSWORD }}
-            buildargs: GO_VERSION=1.14
+            buildargs: GO_VERSION=1.15
             tags: "latest,${{ env.RELEASE_VERSION }}"
             tag_names: true