chore(tooling): Fix container build layers caching

.gitignore

@@ -1 +1,2 @@
+checksums
 ods

Dockerfile

@@ -3,11 +3,8 @@ FROM docker.io/library/golang:1.23-alpine
 
 WORKDIR /usr/src/app
 
-COPY go.mod go.sum ./
-RUN go mod download && go mod verify
-
-COPY . .
-RUN CGO_ENABLED=0 go build ./...
+COPY checksums /
+RUN CGO_ENABLED=0 go build -o /usr/local/bin/ods ./
 
 ##### Run ######################################################################
 FROM alpine:3.20
@@ -16,6 +13,6 @@ ENV LANG en_US.utf8
 
 RUN apk upgrade --no-cache
 
-COPY --from=0 /usr/src/app/ods /usr/local/bin/
+COPY --from=0 /usr/local/bin/ods /usr/local/bin/
 
 ENTRYPOINT ["/usr/local/bin/ods"]

GNUmakefile

@@ -52,7 +52,9 @@ run: ## run the code
 ##### Containers ###############################################################
 .PHONY: container-build
 container-build: ## build the container image
+	printf "Dockerfile GNUmakefile go.mod go.sum index.html main.go ods.txt" | xargs shasum >checksums
 	podman build \
+	    -v $$PWD:/usr/src/app \
 	    -t $(CONTAINER_REGISTRY)/ods:$(CONTAINER_TAG) \
 	    .