feat: add dockerfile and actions to push image

.github/workflows/image_build.yml

@@ -0,0 +1,26 @@
+name: Build Docker Image
+on:
+  push:
+    branches:
+      - main
+jobs:
+    build:
+      name: push docker image to docker hub
+      runs-on: ubuntu-latest
+      steps:
+        - uses: actions/checkout@v2
+        - name: login to docker hub
+          id: docker-hub
+          env:
+            username: ${{secrets.DOCKERHUB_USERNAME}}
+            password: ${{secrets.DOCKERHUB_PASSWORD}}
+          run: |
+            docker login -u $username -p $password 
+        - name: build the docker image
+          id: build-docker-image
+          run: |
+            ls -la 
+            docker build -t docker push ${{secrets.DOCKERHUB_USERNAME}}/s3khoj:latest
+        - name: push the docker image
+          id: push-docker-image
+          run: docker push ${{secrets.DOCKERHUB_USERNAME}}/s3khoj:latest

Dockerfile

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+# Build
+FROM golang:1.22-alpine AS build-env
+RUN apk add build-base
+WORKDIR /app
+COPY . /app
+RUN go mod tidy
+RUN go build -o S3Khoj main.go
+
+# Release
+FROM alpine:3.18.6
+RUN apk upgrade --no-cache \
+    && apk add --no-cache bind-tools 
+COPY --from=build-env /app/S3Khoj /usr/local/bin/S3Khoj
+
+ENTRYPOINT [ "S3Khoj" ]