fix: simplify bake file to avoid locals/function blocks (buildx compat)

The Gitea runner's docker buildx doesn't support HCL locals{} or function{}
blocks (added in buildx 0.12+). Replace with plain variables: VERSION and
MAJOR_MINOR are pre-computed in a CI step and passed as env vars to bake.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/release.yaml

@@ -166,6 +166,14 @@ jobs:
           username: ${{ secrets.DOCKER_USER }}
           password: ${{ secrets.DOCKER_TOKEN }}
 
+      - name: Compute version tags
+        id: ver
+        run: |
+          V="${{ gitea.ref_name }}"
+          VER="${V#v}"
+          echo "version=$VER" >> "$GITHUB_OUTPUT"
+          echo "major_minor=$(echo "$VER" | cut -d. -f1-2)" >> "$GITHUB_OUTPUT"
+
       - name: Download ui build artifacts
         uses: actions/download-artifact@v3
         with:

docker-bake.hcl

@@ -1,56 +1,25 @@
 # docker-bake.hcl — defines all five production images.
 #
-# Used by CI (docker/bake-action) to build and push all images in one call,
-# with shared BuildKit cache and maximum parallelism:
-#   - backend, runner, pocketbase share the Go builder stage (built once)
-#   - caddy and ui build independently in parallel alongside the Go targets
+# Uses only plain variables for broad buildx compatibility (no locals/functions).
+# CI pre-computes VERSION and MAJOR_MINOR from the git tag and passes them as
+# env vars.  Locally, everything gets a :dev tag.
 #
-# Local build (push=false by default):
+# Local build (no push):
 #   docker buildx bake
 #
-# CI passes GIT_TAG (e.g. "v4.1.3") and the bake file computes all three tag
-# variants (full semver, major.minor, latest) — no docker/metadata-action needed.
-
-# ── Variables injected by CI ──────────────────────────────────────────────────
+# CI passes: DOCKER_USER, VERSION, MAJOR_MINOR, COMMIT, BUILD_TIME
 
 variable "DOCKER_USER"  { default = "kalekber" }
-
-# Full git tag, e.g. "v4.1.3".  CI passes this via --set or env.
-# Locally defaults to "dev" so images get a :dev tag.
-variable "GIT_TAG" { default = "dev" }
-
+variable "VERSION"      { default = "dev" }    # e.g. "4.1.6"  (no leading v)
+variable "MAJOR_MINOR"  { default = "dev" }    # e.g. "4.1"
 variable "COMMIT"       { default = "unknown" }
 variable "BUILD_TIME"   { default = "" }
 
-# ── Tag helpers ───────────────────────────────────────────────────────────────
-
-locals {
-  # Strip leading "v": "v4.1.3" → "4.1.3"
-  version = trimprefix(GIT_TAG, "v")
-
-  # major.minor only: "4.1.3" → "4.1"
-  major_minor = join(".", slice(split(".", local.version), 0, 2))
-
-  # true when building a real release tag (not local "dev" build)
-  is_release = GIT_TAG != "dev"
-}
-
-# Return the three standard tags for a given image repo.
-# Always includes :latest and the full version; skips major.minor for dev builds.
-function "img_tags" {
-  params = [repo]
-  result = local.is_release ? [
-    "${repo}:${local.version}",
-    "${repo}:${local.major_minor}",
-    "${repo}:latest",
-  ] : ["${repo}:dev"]
-}
-
 # ── Shared defaults ───────────────────────────────────────────────────────────
 
 target "_defaults" {
   pull     = true
-  # CI overrides this to push=true via --set *.output=type=image,push=true
+  # CI overrides to push=true via --set *.output=type=image,push=true
   output   = ["type=image,push=false"]
   cache-to = ["type=inline"]
 }
@@ -61,10 +30,14 @@ target "backend" {
   inherits   = ["_defaults"]
   context    = "backend"
   target     = "backend"
-  tags       = img_tags("${DOCKER_USER}/libnovel-backend")
+  tags       = [
+    "${DOCKER_USER}/libnovel-backend:${VERSION}",
+    "${DOCKER_USER}/libnovel-backend:${MAJOR_MINOR}",
+    "${DOCKER_USER}/libnovel-backend:latest",
+  ]
   cache-from = ["type=registry,ref=${DOCKER_USER}/libnovel-backend:latest"]
   args = {
-    VERSION = local.version
+    VERSION = VERSION
     COMMIT  = COMMIT
   }
 }
@@ -73,10 +46,14 @@ target "runner" {
   inherits   = ["_defaults"]
   context    = "backend"
   target     = "runner"
-  tags       = img_tags("${DOCKER_USER}/libnovel-runner")
+  tags       = [
+    "${DOCKER_USER}/libnovel-runner:${VERSION}",
+    "${DOCKER_USER}/libnovel-runner:${MAJOR_MINOR}",
+    "${DOCKER_USER}/libnovel-runner:latest",
+  ]
   cache-from = ["type=registry,ref=${DOCKER_USER}/libnovel-runner:latest"]
   args = {
-    VERSION = local.version
+    VERSION = VERSION
     COMMIT  = COMMIT
   }
 }
@@ -85,7 +62,11 @@ target "pocketbase" {
   inherits   = ["_defaults"]
   context    = "backend"
   target     = "pocketbase"
-  tags       = img_tags("${DOCKER_USER}/libnovel-pocketbase")
+  tags       = [
+    "${DOCKER_USER}/libnovel-pocketbase:${VERSION}",
+    "${DOCKER_USER}/libnovel-pocketbase:${MAJOR_MINOR}",
+    "${DOCKER_USER}/libnovel-pocketbase:latest",
+  ]
   cache-from = ["type=registry,ref=${DOCKER_USER}/libnovel-pocketbase:latest"]
 }
 
@@ -94,10 +75,14 @@ target "pocketbase" {
 target "ui" {
   inherits   = ["_defaults"]
   context    = "ui"
-  tags       = img_tags("${DOCKER_USER}/libnovel-ui")
+  tags       = [
+    "${DOCKER_USER}/libnovel-ui:${VERSION}",
+    "${DOCKER_USER}/libnovel-ui:${MAJOR_MINOR}",
+    "${DOCKER_USER}/libnovel-ui:latest",
+  ]
   cache-from = ["type=registry,ref=${DOCKER_USER}/libnovel-ui:latest"]
   args = {
-    BUILD_VERSION = local.version
+    BUILD_VERSION = VERSION
     BUILD_COMMIT  = COMMIT
     BUILD_TIME    = BUILD_TIME
     PREBUILT      = "1"
@@ -109,7 +94,11 @@ target "ui" {
 target "caddy" {
   inherits   = ["_defaults"]
   context    = "caddy"
-  tags       = img_tags("${DOCKER_USER}/libnovel-caddy")
+  tags       = [
+    "${DOCKER_USER}/libnovel-caddy:${VERSION}",
+    "${DOCKER_USER}/libnovel-caddy:${MAJOR_MINOR}",
+    "${DOCKER_USER}/libnovel-caddy:latest",
+  ]
   cache-from = ["type=registry,ref=${DOCKER_USER}/libnovel-caddy:latest"]
 }