feat: Idiomatic go language versioning

.github/workflows/build.yaml

@@ -27,16 +27,14 @@ jobs:
       - name: Setup environment
         id: environment
         run: |
-          GOVERSION=$(make go-version)
-          echo "GOVERSION=${GOVERSION}" >> $GITHUB_ENV
           echo "DOCKER_BUILDKIT=1" >> $GITHUB_ENV
           echo "DOCKER_CLI_EXPERIMENTAL=enabled" >> $GITHUB_ENV
 
       - name: Set up Golang
         uses: actions/setup-go@v5
         id: go
         with:
-          go-version: ${{ env.GOVERSION }}
+          go-version-file: .go-version
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
@@ -73,17 +71,11 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Setup environment
-        id: environment
-        run: |
-          GOVERSION=$(make go-version)
-          echo "GOVERSION=${GOVERSION}" >> $GITHUB_ENV
-
       - name: Set up Golang
         uses: actions/setup-go@v5
         id: go
         with:
-          go-version: ${{ env.GOVERSION }}
+          go-version-file: .go-version
 
       - name: Install Tools and Dependencies
         run: make deps
@@ -113,15 +105,13 @@ jobs:
       - name: Setup environment
         id: environment
         run: |
-          GOVERSION=$(make go-version)
-          echo "GOVERSION=${GOVERSION}" >> $GITHUB_ENV
           echo "PROMGITHUB_REDIS_ADDR=127.0.0.1:6379" >> $GITHUB_ENV
 
       - name: Set up Golang
         uses: actions/setup-go@v5
         id: go
         with:
-          go-version: ${{ env.GOVERSION }}
+          go-version-file: .go-version
 
       - name: Install Tools and Dependencies
         run: make deps

.github/workflows/release.yaml

@@ -29,16 +29,14 @@ jobs:
       - name: Setup environment
         id: environment
         run: |
-          GOVERSION=$(make go-version)
-          echo "GOVERSION=${GOVERSION}" >> $GITHUB_ENV
           echo "DOCKER_BUILDKIT=1" >> $GITHUB_ENV
           echo "DOCKER_CLI_EXPERIMENTAL=enabled" >> $GITHUB_ENV
 
       - name: Set up Golang
         uses: actions/setup-go@v5
         id: go
         with:
-          go-version: ${{ env.GOVERSION }}
+          go-version-file: .go-version
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3

.go-version

@@ -0,0 +1 @@
+1.25.10

Dockerfile

@@ -1,5 +1,6 @@
 # Build stage
-FROM golang:1.25.9 AS builder
+ARG GO_VERSION=1.25.10
+FROM golang:${GO_VERSION} AS builder
 
 # Set non-root user for build
 RUN useradd -u 10001 -m builder

Makefile

@@ -11,6 +11,7 @@ COLOR_RED		:= \033[31m
 USERNAME		:= darthfork
 TARGET			:= promgithub
 SRC			:= ./...
+GO_VERSION		:= $(shell cat .go-version)
 LDFLAGS			:= -X main.Version=$(VERSION) -s -w
 LDFLAGS_DBG		:= -X main.enableDebug=true -X main.Version=$(VERSION)
 BUILDDIR		:= build
@@ -70,7 +71,7 @@ install_tools: deps ## Install development tooling
 	@./utils/install_tools.sh
 
 container: ## Build promgithub service container
-	@docker build --progress=plain -t $(CONTAINER_REGISTRY):$(VERSION) .
+	@docker build --progress=plain --build-arg GO_VERSION=$(GO_VERSION) -t $(CONTAINER_REGISTRY):$(VERSION) .
 
 package-helm-chart: mkdir ## Package promgithub helm chart
 	@helm package $(CHART_SOURCE) -d $(BUILDDIR)
@@ -84,6 +85,7 @@ build-cross-platform-binaries: mkdir
 build-cross-platform-container: ci-check
 	@docker buildx build \
 		--platform $(PLATFORMS)\
+		--build-arg GO_VERSION=$(GO_VERSION) \
 		-t $(CONTAINER_REGISTRY):$(VERSION) \
 		--cache-from type=gha,scope=$(TARGET) \
 		--cache-to type=gha,mode=max,scope=$(TARGET) \
@@ -126,7 +128,7 @@ setup-commit-hooks:
 	@cp .github/hooks/* .git/hooks/
 
 go-version:
-	@grep '^go ' go.mod | awk '{print $$2}'
+	@cat .go-version
 
 help:
 	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' Makefile\