docker: Fix missing CLN version in docker image

Changelog-Fixed: Core lightning version in Docker image will not be missing.

.dockerignore

@@ -1,6 +1,10 @@
-Dockerfile
-contrib/docker/Dockerfile.*
-target
 config.vars
+.cargo/
+.vscode/
+.venv/
+dist/
+target/
 release/
-.venv/
+focal/
+jammy/
+noble/

.github/workflows/docker-release.yml

@@ -36,6 +36,7 @@ jobs:
       uses: actions/checkout@v4
       with:
         ref: ${{ github.ref }}  # Ensures the branch triggering the workflow is checked out
+        fetch-depth: 0
 
     - name: Set up QEMU
       uses: docker/setup-qemu-action@v3
@@ -116,3 +117,5 @@ jobs:
         push: true
         platforms: ${{ env.PLATFORMS }}
         tags: ${{ env.TAGS }}
+        build-args: |
+          VERSION=${{ env.VERSION }}

.gitignore

@@ -86,6 +86,7 @@ plugins/clnrest
 plugins/wss-proxy
 plugins/cln-bip353
 .clangd
+.cargo/
 
 # Build directories
 bionic/

Dockerfile

@@ -125,6 +125,8 @@ ARG LD=${target_arch}-ld
 ARG STRIP=${target_arch}-strip
 ARG TARGET=${target_arch_rust}
 ARG RUST_PROFILE=release
+ARG VERSION
+ENV VERSION=${VERSION}
 
 #TODO: set all the following cargo config options via env variables (https://doc.rust-lang.org/cargo/reference/environment-variables.html)
 RUN mkdir -p .cargo && tee .cargo/config.toml <<EOF

Makefile

@@ -1,7 +1,10 @@
 #! /usr/bin/make
 
+# Prefer VERSION from environment if provided (e.g., from GitHub Actions)
 # Extract version from git, or if we're from a zipfile, use dirname
-VERSION=$(shell git describe --tags --always --dirty=-modded --abbrev=7 2>/dev/null || pwd | $(SED) -n 's|.*/c\{0,1\}lightning-v\{0,1\}\([0-9a-f.rc\-]*\)$$|v\1|gp')
+VERSION ?= $(shell git describe --tags --always --dirty=-modded --abbrev=7 2>/dev/null || \
+	pwd | sed -n 's|.*/c\{0,1\}lightning-v\{0,1\}\([0-9a-f.rc\-]*\)$$|v\1|gp')
+$(info Building version $(VERSION))
 
 # Next release.
 CLN_NEXT_VERSION := v25.12