fix: embed version in branch Docker images

Author: m0wer

.github/workflows/docker.yaml

@@ -43,6 +43,12 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v7.0.1
+        with:
+          fetch-depth: 0
+
+      - name: Get version
+        id: version
+        run: echo "version=$(git describe --tags --always)" >> "$GITHUB_OUTPUT"
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v4.3.0
@@ -76,6 +82,8 @@ jobs:
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
+          build-args: |
+            VERSION=${{ steps.version.outputs.version }}
           cache-from: type=gha
           cache-to: type=gha,mode=max
           platforms: linux/amd64,linux/386,linux/arm64,linux/arm/v7,linux/arm/v6

.github/workflows/test.yaml

@@ -60,7 +60,12 @@ jobs:
       - uses: actions/checkout@v7.0.1
 
       - name: Build Docker image
-        run: docker build -t neutrino-api:test ./neutrino_server
+        run: docker build --build-arg VERSION=ci-test -t neutrino-api:test ./neutrino_server
+
+      - name: Test Docker image version
+        run: |
+          test "$(docker run --rm --entrypoint neutrinod neutrino-api:test -version)" = \
+            "neutrinod ci-test"
 
       - name: Test Docker image runs
         run: |

CHANGELOG.md

@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+
+- Embed the Git tag or commit description in branch Docker images instead of
+  reporting the fallback `dev` version.
+
 ## [1.7.0] - 2026-08-24
 
 ### Changed