Fixed CI/CD to build arm architecture image

.github/workflows/main.yml

@@ -31,7 +31,16 @@ jobs:
         repository: ekofr/pihole-exporter
         tag_with_sha: true
         tags: amd64
-        build_args: OS=linux,ARCH=amd64
+        build_args: OS=linux,ARCH=amd64,IMAGE=scratch
+    - name: Build and Push Docker Image (Linux - ARM32)
+      uses: docker/build-push-action@v1
+      with:
+        username: ${{ secrets.DOCKER_USERNAME }}
+        password: ${{ secrets.DOCKER_PASSWORD }}
+        repository: ekofr/pihole-exporter
+        tag_with_sha: true
+        tags: arm32
+        build_args: OS=linux,ARCH=arm32,IMAGE=arm32v7/alpine:3.11
     - name: Build and Push Docker Image (Linux - ARM64)
       uses: docker/build-push-action@v1
       with:
@@ -40,4 +49,4 @@ jobs:
         repository: ekofr/pihole-exporter
         tag_with_sha: true
         tags: arm64
-        build_args: OS=linux,ARCH=arm64
+        build_args: OS=linux,ARCH=arm64,IMAGE=arm64v8/alpine:3.11

Dockerfile

@@ -2,6 +2,7 @@ FROM golang:alpine as builder
 
 ARG OS=linux
 ARG ARCH=amd64
+ARG IMAGE=scratch
 
 WORKDIR /go/src/github.com/eko/pihole-exporter
 COPY . .
@@ -13,7 +14,7 @@ RUN GO111MODULE=on go mod vendor
 RUN CGO_ENABLED=0 GOOS=$OS GOARCH=$ARCH go build -ldflags '-s -w' -o binary ./
 RUN upx -f --brute binary
 
-FROM scratch
+FROM $IMAGE
 
 LABEL name="pihole-exporter"