fix: properly inject version into Docker image builds

The agent version was always showing 0.1.0 because build.rs tried to
run 'git describe' inside the Docker build, but .git directory wasn't
copied into the image.

Changes:
- Add VERSION build arg to Dockerfile
- Pass VERSION as env var to cargo build commands
- Update GitLab CI to pass --build-arg VERSION
- Modify build.rs to prefer BUILD_VERSION env var over git commands

This ensures the version displayed by the agent matches the Docker
image tag it was built with.

.gitlab-ci.yml

@@ -77,6 +77,7 @@ build:main:
     - |
       docker buildx build \
         --platform linux/amd64 \
+        --build-arg VERSION=$VERSION \
         --cache-from type=registry,ref=$REGISTRY/$IMAGE_NAME:buildcache \
         --cache-to type=registry,ref=$REGISTRY/$IMAGE_NAME:buildcache,mode=max \
         --tag $REGISTRY/$IMAGE_NAME:latest \
@@ -116,6 +117,7 @@ release:multiarch:
 
       docker buildx build \
         --platform linux/amd64,linux/arm64 \
+        --build-arg VERSION=$VERSION \
         --cache-from type=registry,ref=$REGISTRY/$IMAGE_NAME:buildcache \
         --cache-to type=registry,ref=$REGISTRY/$IMAGE_NAME:buildcache,mode=max \
         --tag $REGISTRY/$IMAGE_NAME:$VERSION \

Cargo.lock

@@ -8,18 +8,6 @@ version = "2.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "320119579fcad9c21884f5c4861d16174d0e06250625266f50fe6898340abefa"
 
-[[package]]
-name = "ahash"
-version = "0.8.12"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5a15f179cd60c4584b8a8c596927aadc462e27f2ca70c04e0071964a73ba7a75"
-dependencies = [
- "cfg-if",
- "once_cell",
- "version_check",
- "zerocopy",
-]
-
 [[package]]
 name = "aho-corasick"
 version = "1.1.4"
@@ -315,18 +303,6 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
-[[package]]
-name = "fallible-iterator"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2acce4a10f12dc2fb14a218589d4f1f62ef011b2d0cc4b3cb1bba8e94da14649"
-
-[[package]]
-name = "fallible-streaming-iterator"
-version = "0.1.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7360491ce676a36bf9bb3c56c1aa791658183a54d2744120f27285738d90465a"
-
 [[package]]
 name = "fastrand"
 version = "2.3.0"
@@ -486,30 +462,12 @@ dependencies = [
  "wasip2",
 ]
 
-[[package]]
-name = "hashbrown"
-version = "0.14.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e5274423e17b7c9fc20b6e7e208532f9b19825d82dfd615708b70edd83df41f1"
-dependencies = [
- "ahash",
-]
-
 [[package]]
 name = "hashbrown"
 version = "0.16.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "841d1cc9bed7f9236f321df977030373f4a4163ae1a7dbfe1a51a2c1a51d9100"
 
-[[package]]
-name = "hashlink"
-version = "0.9.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6ba4ff7128dee98c7dc9794b6a411377e1404dba1c97deb8d1a55297bd25d8af"
-dependencies = [
- "hashbrown 0.14.5",
-]
-
 [[package]]
 name = "heck"
 version = "0.5.0"
@@ -682,7 +640,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7714e70437a7dc3ac8eb7e6f8df75fd8eb422675fc7678aff7364301092b1017"
 dependencies = [
  "equivalent",
- "hashbrown 0.16.1",
+ "hashbrown",
 ]
 
 [[package]]
@@ -722,17 +680,6 @@ version = "0.2.180"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bcc35a38544a891a5f7c865aca548a982ccb3b8650a5b06d0fd33a10283c56fc"
 
-[[package]]
-name = "libsqlite3-sys"
-version = "0.30.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2e99fb7a497b1e3339bc746195567ed8d3e24945ecd636e3619d20b9de9e9149"
-dependencies = [
- "cc",
- "pkg-config",
- "vcpkg",
-]
-
 [[package]]
 name = "linux-raw-sys"
 version = "0.11.0"
@@ -838,12 +785,6 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
 
-[[package]]
-name = "pkg-config"
-version = "0.3.32"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7edddbd0b52d732b21ad9a5fab5c704c14cd949e5e9a1ec5929a24fded1b904c"
-
 [[package]]
 name = "potential_utf"
 version = "0.1.4"
@@ -1021,20 +962,6 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
-[[package]]
-name = "rusqlite"
-version = "0.32.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7753b721174eb8ff87a9a0e799e2d7bc3749323e773db92e0984debb00019d6e"
-dependencies = [
- "bitflags",
- "fallible-iterator",
- "fallible-streaming-iterator",
- "hashlink",
- "libsqlite3-sys",
- "smallvec",
-]
-
 [[package]]
 name = "rustix"
 version = "1.1.3"
@@ -1375,7 +1302,6 @@ dependencies = [
  "prost-build",
  "prost-types",
  "rand",
- "rusqlite",
  "serde",
  "serde_json",
  "snmp",
@@ -1474,12 +1400,6 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "06abde3611657adf66d383f00b093d7faecc7fa57071cce2578660c9f1010821"
 
-[[package]]
-name = "vcpkg"
-version = "0.2.15"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "accd4ea62f7bb7a82fe23066fb0957d48ef677f6eeb8215f372f52e48bb32426"
-
 [[package]]
 name = "version_check"
 version = "0.9.5"

Dockerfile

@@ -3,6 +3,7 @@ FROM rust:1.83-alpine AS builder
 
 # Build arguments provided by Docker buildx
 ARG TARGETPLATFORM
+ARG VERSION=0.1.0-unknown
 
 WORKDIR /app
 
@@ -27,7 +28,7 @@ RUN mkdir src && echo "fn main() {}" > src/main.rs
 
 # Build dependencies (cached layer)
 RUN RUST_TARGET=$(cat /tmp/rust-target) && \
-    cargo build --release --target "$RUST_TARGET"
+    BUILD_VERSION="$VERSION" cargo build --release --target "$RUST_TARGET"
 
 # Remove dummy src
 RUN rm -rf src
@@ -38,7 +39,7 @@ COPY src ./src
 # Build the actual application
 RUN RUST_TARGET=$(cat /tmp/rust-target) && \
     touch src/main.rs && \
-    cargo build --release --target "$RUST_TARGET" && \
+    BUILD_VERSION="$VERSION" cargo build --release --target "$RUST_TARGET" && \
     cp "target/$RUST_TARGET/release/towerops-agent" /tmp/towerops-agent
 
 # Runtime stage

build.rs

@@ -11,7 +11,14 @@ fn main() {
 }
 
 fn get_version() -> String {
-    // Try git describe first - gives us the most descriptive version
+    // First check if BUILD_VERSION is already set (e.g., from Docker build arg)
+    if let Ok(version) = std::env::var("BUILD_VERSION") {
+        if !version.is_empty() && version != "0.1.0-unknown" {
+            return version;
+        }
+    }
+
+    // Try git describe - gives us the most descriptive version
     // Examples:
     //   v0.2.0          -> "0.2.0"           (exact tag)
     //   v0.2.0-5-g831588e -> "0.2.0.5.831588e" (5 commits after v0.2.0)