Fix: Dockerfile image issue

* update dockerfile to fix earlier issue with non-existent directory
* added docker image workflow to enable build after push on main branch

.github/workflows/docker-image.yml

@@ -0,0 +1,18 @@
+name: Docker Image CI
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Build the Docker image
+      run: docker build . --file Dockerfile --tag my-image-name:$(date +%s)

Dockerfile

@@ -1,13 +1,17 @@
 FROM golang:1.18 as build
 WORKDIR /go/src/app
+
+# Copy the entire source code to the container's workspace
 COPY . .
-# Static build requires CGO_ENABLED=0
-RUN mkdir -p /go/bin && CGO_ENABLED=0 go build -ldflags="-w -s" -o /go/bin/app ./...
+# Debugging step: Check current directory and contents of the 'cmd' directory
+RUN pwd
+RUN ls -la /go/src/app/cmd
 
-# Using a distroless image from https://github.com/GoogleContainerTools/distroless
-# Image sourced from https://console.cloud.google.com/gcr/images/distroless/global/static
+# Static build
+RUN CGO_ENABLED=0 go build -ldflags="-w -s" -o /go/bin/app ./cmd
 FROM gcr.io/distroless/static:nonroot
-COPY --from=build /go/bin/app /
-# numeric version of user nonroot:nonroot provided in image
+COPY --from=build /go/bin/app /app
+
 USER 65532:65532
+
 CMD ["/app"]