use go.mod as single source of truth for Go version in CI, Dockerfiles, and Makefile

Author: Sandeep

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.25'
+          go-version-file: 'go.mod'
           cache: false  # golangci-lint-action handles its own caching
 
       - name: Run golangci-lint
@@ -45,7 +45,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.25'
+          go-version-file: 'go.mod'
           cache: true
 
       - name: Run go vet
@@ -62,7 +62,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.25'
+          go-version-file: 'go.mod'
           cache: true
 
       - name: Install staticcheck
@@ -71,11 +71,25 @@ jobs:
       - name: Run staticcheck
         run: staticcheck ./...
 
+  resolve-go-version:
+    name: Resolve Go version
+    runs-on: ubuntu-latest
+    outputs:
+      go-version: ${{ steps.go-version.outputs.version }}
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v5
+
+      - name: Extract Go version from go.mod
+        id: go-version
+        run: echo "version=$(grep '^go ' go.mod | awk '{print $2}')" >> "$GITHUB_OUTPUT"
+
   build:
     name: Build (Alpine)
+    needs: resolve-go-version
     runs-on: ubuntu-latest
     container:
-      image: golang:1.25-alpine
+      image: golang:${{ needs.resolve-go-version.outputs.go-version }}-alpine
 
     steps:
       - name: Install build dependencies
@@ -101,7 +115,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.25'
+          go-version-file: 'go.mod'
           cache: true
 
       - name: Install Java (for JVM tests)

Dockerfile.base.alpine

@@ -1,6 +1,7 @@
 # syntax=docker/dockerfile:1.6
 
-FROM golang:1.25.8-alpine AS builder
+ARG GO_VERSION
+FROM golang:${GO_VERSION}-alpine AS builder
 
 RUN apk add --no-cache \
     clang \

Dockerfile.linux

@@ -1,4 +1,5 @@
-FROM golang:1.25.8-alpine AS builder
+ARG GO_VERSION
+FROM golang:${GO_VERSION}-alpine AS builder
 WORKDIR /app
 RUN apk add --no-cache \
     clang \
@@ -15,8 +16,8 @@ FROM scratch AS final
 COPY --from=builder /app/cmd/yc/yc /yc
 ENTRYPOINT ["/yc"]
 
-### command to build yc file
+### command to build yc file (GO_VERSION is read from go.mod)
 ## If ARM64
-# docker buildx build -f Dockerfile.linux --target final -o type=local,dest=./bin/linux/arm64 .
+# docker buildx build -f Dockerfile.linux --build-arg GO_VERSION=$(grep '^go ' go.mod | awk '{print $2}') --target final -o type=local,dest=./bin/linux/arm64 .
 ## If x86_64
-# docker buildx build -f Dockerfile.linux --target final -o type=local,dest=./bin/linux/amd64 .
+# docker buildx build -f Dockerfile.linux --build-arg GO_VERSION=$(grep '^go ' go.mod | awk '{print $2}') --target final -o type=local,dest=./bin/linux/amd64 .

Makefile

@@ -1,4 +1,5 @@
 CWD := $(shell pwd)
+GO_VERSION := $(shell grep '^go ' go.mod | awk '{print $$2}')
 
 IMAGE_NAME := yc-360-script-base:alpine
 CONTAINER_NAME := yc-360-script-base-alpine
@@ -9,7 +10,7 @@ _:
 	echo "default"
 
 alpine:
-	docker build -f Dockerfile.base.alpine -t $(IMAGE_NAME) .
+	docker build --build-arg GO_VERSION=$(GO_VERSION) -f Dockerfile.base.alpine -t $(IMAGE_NAME) .
 
 base: alpine
 	docker rm -f $(CONTAINER_NAME) || true
@@ -35,6 +36,7 @@ build-all:
 
 	# linux/amd64
 	docker buildx build \
+		--build-arg GO_VERSION=$(GO_VERSION) \
 		--platform linux/amd64 \
 		-f Dockerfile.base.alpine \
 		--target export \
@@ -43,6 +45,7 @@ build-all:
 
 	# linux/arm64
 	docker buildx build \
+		--build-arg GO_VERSION=$(GO_VERSION) \
 		--platform linux/arm64 \
 		-f Dockerfile.base.alpine \
 		--target export \