Update Gitpod config files

Author: devlights

.gitpod.Dockerfile

@@ -0,0 +1,12 @@
+FROM gitpod/workspace-go:latest
+
+USER gitpod
+
+RUN sudo apt update -q && \
+    rm -rf /home/gitpod/tmp && \
+    mkdir -p /home/gitpod/tmp && \
+    cd /home/gitpod/tmp && \
+    wget -q -O go.tar.gz https://go.dev/dl/go1.20.1.linux-amd64.tar.gz && \
+    tar zxf go.tar.gz && \
+    mv /home/gitpod/go /home/gitpod/go-old && \
+    mv go /home/gitpod

.gitpod.yml

@@ -1,22 +1,13 @@
-image: gitpod/workspace-go:latest
+image:
+  file: .gitpod.Dockerfile
 
 tasks:
-  - name: update apt
-    init: sudo apt update -q
   - name: update go and tools
-    command:
-      rm -rf /home/gitpod/tmp &&
-      mkdir -p /home/gitpod/tmp &&
-      cd /home/gitpod/tmp &&
-      wget -q -O go.tar.gz https://go.dev/dl/go1.20.1.linux-amd64.tar.gz &&
-      tar zxf go.tar.gz &&
-      mv /home/gitpod/go /home/gitpod/go-old &&
-      mv go /home/gitpod &&
+    init:
       go install github.com/go-task/task/v3/cmd/task@latest &&
       go install honnef.co/go/tools/cmd/staticcheck@latest &&
       go install golang.org/x/tools/cmd/goimports@latest &&
       go install github.com/mgechev/revive@latest &&
-      exit
 
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