Enable docker buildkit in CI

Set DOCKER_BUILDKIT in github actions

.github/workflows/integration-tests.yml

@@ -11,6 +11,7 @@ jobs:
     name: autopeering
     env:
       TEST_NAME: autopeering
+      DOCKER_BUILDKIT: 1
     runs-on: ubuntu-latest
     steps:
 
@@ -46,6 +47,7 @@ jobs:
     name: common
     env:
       TEST_NAME: common
+      DOCKER_BUILDKIT: 1
     runs-on: ubuntu-latest
     steps:
 
@@ -80,6 +82,7 @@ jobs:
     name: consensus
     env:
       TEST_NAME: consensus
+      DOCKER_BUILDKIT: 1
     runs-on: ubuntu-latest
     steps:
 
@@ -115,6 +118,7 @@ jobs:
     name: drng
     env:
       TEST_NAME: drng
+      DOCKER_BUILDKIT: 1
     runs-on: ubuntu-latest
     steps:
 
@@ -151,6 +155,7 @@ jobs:
     name: message
     env:
       TEST_NAME: message
+      DOCKER_BUILDKIT: 1
     runs-on: ubuntu-latest
     steps:
 
@@ -187,6 +192,7 @@ jobs:
     name: value
     env:
       TEST_NAME: value
+      DOCKER_BUILDKIT: 1
     runs-on: ubuntu-latest
     steps:
 
@@ -221,6 +227,7 @@ jobs:
     name: faucet
     env:
       TEST_NAME: faucet
+      DOCKER_BUILDKIT: 1
     runs-on: ubuntu-latest
     steps:
 
@@ -255,6 +262,7 @@ jobs:
     name: syncbeacon
     env:
       TEST_NAME: syncbeacon
+      DOCKER_BUILDKIT: 1
     runs-on: ubuntu-latest
     steps:
 
@@ -289,6 +297,7 @@ jobs:
     name: mana
     env:
       TEST_NAME: mana
+      DOCKER_BUILDKIT: 1
     runs-on: ubuntu-latest
     steps:
 

Dockerfile

@@ -20,13 +20,12 @@ ENV GO111MODULE=on
 RUN go mod download
 RUN go mod verify
 
-COPY . .
-
 # 1. Mount everything from the current directory to the PWD(Present Working Directory) inside the container
 # 2. Mount the build cache volume
 # 3. Build the binary
 # 4. Verify that goshimmer binary is statically linked
-RUN --mount=type=cache,target=/root/.cache/go-build \
+RUN --mount=target=. \
+    --mount=type=cache,target=/root/.cache/go-build \
     CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build \
     -ldflags='-w -s -extldflags "-static"' \
     -o /go/bin/goshimmer; \