build: support arm64 architecture (#768)

Signed-off-by: fsl <[email protected]>

Signed-off-by: fsl <[email protected]>

Dockerfile

@@ -1,11 +1,8 @@
 FROM golang:1.19.4-alpine as base
-ARG ARCH=amd64
+ARG TARGETARCH
 ARG VERSION
 ARG COMMIT
 ARG DATE
-ENV GOOS=linux \
-    CGO_ENABLED=0 \
-    GOARCH=${ARCH}
 RUN apk add --no-cache git
 WORKDIR /app
 
@@ -17,7 +14,7 @@ COPY . .
 
 ## BUILDER STAGE ##
 FROM base as builder
-RUN go build -o conftest -ldflags="-w -s -X github.com/open-policy-agent/conftest/internal/commands.version=${VERSION}" main.go
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=${TARGETARCH} go build -o conftest -ldflags="-w -s -X github.com/open-policy-agent/conftest/internal/commands.version=${VERSION}" main.go
 
 ## TEST STAGE ##
 FROM base as test
@@ -42,18 +39,18 @@ COPY examples /examples
 
 WORKDIR /tmp
 RUN apk add --no-cache npm make git jq ca-certificates openssl unzip wget && \
-    wget "https://releases.hashicorp.com/terraform/${TERRAFORM_VERSION}/terraform_${TERRAFORM_VERSION}_linux_amd64.zip" && \
+    wget "https://releases.hashicorp.com/terraform/${TERRAFORM_VERSION}/terraform_${TERRAFORM_VERSION}_linux_${TARGETARCH}.zip" && \
     unzip "terraform_${TERRAFORM_VERSION}_linux_amd64.zip" -d /usr/local/bin
 
-RUN wget -O /usr/local/bin/kustomize "https://github.com/kubernetes-sigs/kustomize/releases/download/v${KUSTOMIZE_VERSION}/kustomize_${KUSTOMIZE_VERSION}_linux_amd64" && \
+RUN wget -O /usr/local/bin/kustomize "https://github.com/kubernetes-sigs/kustomize/releases/download/v${KUSTOMIZE_VERSION}/kustomize_${KUSTOMIZE_VERSION}_linux_${TARGETARCH}" && \
     chmod +x /usr/local/bin/kustomize
 
 RUN go install cuelang.org/go/cmd/cue@latest
 
 WORKDIR /examples
 
 ## RELEASE ##
-FROM alpine:3.17.0
+FROM alpine:3.17.1
 
 # Install git for protocols that depend on it when using conftest pull
 RUN apk add --no-cache git