docker: ensure cleaner contexts for Docker builds

`make docker` builds the context from a tarball. We don't use git
archive as we want to allow local modifications without committing them.
This is not unlike nix work.

For the other Docker files, use a tailored `.dockerignore`:

 - dev, ignore everything except bin/akvorado
 - ipinfo-geoipupdate, ignore everything except the update script
 - nix, let nix handle it from the Git repository

.dockerignore

@@ -1,2 +0,0 @@
-.git
-console/frontend/node_modules/

.github/workflows/ipinfo.yml

@@ -31,7 +31,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
       - uses: docker/build-push-action@v6
         with:
-          context: docker
+          context: .
           file: docker/Dockerfile.ipinfo-geoipupdate
           platforms: linux/amd64,linux/arm64,linux/arm/v7
           push: true

Makefile

@@ -286,8 +286,8 @@ version:
 .PHONY: docker docker-dev
 DOCKER_BUILD_ARGS =
 docker: ; $(info $(M) build Docker image…) @ ## Build Docker image
-	$Q docker build --pull -f docker/Dockerfile $(DOCKER_BUILD_ARGS) \
-		--build-arg VERSION=$(VERSION) -t ghcr.io/akvorado/akvorado:main .
+	$Q git ls-files | tar -T- -cf- | docker build --pull -f docker/Dockerfile $(DOCKER_BUILD_ARGS) \
+		--build-arg VERSION=$(VERSION) -t ghcr.io/akvorado/akvorado:main -
 docker-dev: TARGETOS=linux
 docker-dev: all ; $(info $(M) build development Docker image…) @ ## Build development Docker image
 	$Q docker build -f docker/Dockerfile.dev $(DOCKER_BUILD_ARGS) \

docker/Dockerfile.dev.dockerignore

@@ -0,0 +1,2 @@
+*
+!bin/akvorado

docker/Dockerfile.dockerignore

@@ -0,0 +1 @@
+.git

docker/Dockerfile.ipinfo-geoipupdate

@@ -5,7 +5,7 @@ RUN apk add --no-cache curl
 WORKDIR /data
 VOLUME /data
 
-COPY --chmod=555 ipinfo-geoipupdate.sh /usr/local/bin/ipinfo-geoipupdate.sh
+COPY --chmod=555 docker/ipinfo-geoipupdate.sh /usr/local/bin/ipinfo-geoipupdate.sh
 
 LABEL org.opencontainers.image.description="IPinfo database updater"
 HEALTHCHECK --interval=20s CMD test -f /tmp/healthy

docker/Dockerfile.ipinfo-geoipupdate.dockerignore

@@ -0,0 +1,2 @@
+*
+!docker/ipinfo-geoipupdate.sh