added make script and vars

dockerfile

@@ -0,0 +1,33 @@
+# Stage 1 · go builder
+ARG GO_BUILDER=golang
+ARG GO_VERSION=latest
+FROM ${GO_BUILDER}:${GO_VERSION} AS build
+
+ARG GO_OS
+ARG GO_ARCH
+ARG GIT_HOST
+ARG REPO_ORG
+ARG REPO_NAME
+ARG APP_VERSION
+
+# Copy the project inside the builder container
+WORKDIR $GOPATH/src/${GIT_HOST}/$REPO_ORG/$REPO_NAME/
+COPY . .
+
+# Build the binary
+RUN CGO_ENABLED=0 GOOS=${GO_OS} GOARCH=${GO_ARCH} \
+    go build \
+    -installsuffix cgo \
+    -ldflags="-w -s -X 'main.APP_VERSION=${APP_VERSION}' -X 'main.COMMIT_ID=$(git log HEAD --oneline | awk '{print $1}' | head -n1)'" \
+    --o /app
+
+# Stage 2 · scratch image
+FROM scratch
+
+# Copy the necessary stuff from the build stage
+COPY --from=build /app /app
+# Copy the certificates - in case of fetches
+COPY --from=build /etc/ssl/certs/ca-certificates.crt /etc/ssl/cert.pem
+
+# Execute the binary
+ENTRYPOINT ["/app"]