Add 4.0 document

.github/workflows/image-build.yml

@@ -1,26 +1,8 @@
 name: Image build
 on: [pull_request]
 jobs:
-  ep-build-amd64:
-    name: Image build/amd64 LEGACY entrypoint
-    runs-on: ubuntu-latest
-    steps:
-      - name: Check out code into the Go module directory
-        uses: actions/checkout@v2
-
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v1
-
-      - name: Build container image
-        uses: docker/build-push-action@v2
-        with:
-          context: .
-          push: false
-          tags: ghcr.io/${{ github.repository }}:ep-latest-amd64
-          file: images/Dockerfile
-
   build-amd64:
-    name: Image build/amd64 daemonized alternative
+    name: Image build/amd64 thin plugin
     runs-on: ubuntu-latest
     steps:
       - name: Check out code into the Go module directory
@@ -35,6 +17,24 @@ jobs:
           context: .
           push: false
           tags: ghcr.io/${{ github.repository }}:latest-amd64
+          file: images/Dockerfile
+
+  build-amd64-thick:
+    name: Image build/amd64 thick plugin
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code into the Go module directory
+        uses: actions/checkout@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Build container image
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          push: false
+          tags: ghcr.io/${{ github.repository }}:latest-amd64-thick
           file: images/Dockerfile.thick
 
   build-arm64: