fix(ci): stabilize Rust and Docker builds

.github/workflows/ci.yml

@@ -31,8 +31,9 @@ jobs:
       - uses: actions/checkout@v5
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@nightly
+        uses: dtolnay/rust-toolchain@master
         with:
+          toolchain: nightly-2026-08-21
           components: rustfmt
 
       - name: Check formatting
@@ -46,8 +47,9 @@ jobs:
       - uses: actions/checkout@v5
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@nightly
+        uses: dtolnay/rust-toolchain@master
         with:
+          toolchain: nightly-2026-08-21
           components: clippy
 
       - name: Install build dependencies
@@ -69,7 +71,9 @@ jobs:
       - uses: actions/checkout@v5
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@nightly
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: nightly-2026-08-21
 
       - name: Install build dependencies
         run: sudo apt-get update && sudo apt-get install -y protobuf-compiler nasm libclang-dev
@@ -88,7 +92,9 @@ jobs:
       - uses: actions/checkout@v5
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@nightly
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: nightly-2026-08-21
 
       - name: Install build dependencies
         run: sudo apt-get update && sudo apt-get install -y protobuf-compiler nasm libclang-dev
@@ -108,7 +114,9 @@ jobs:
       - uses: actions/checkout@v5
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@nightly
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: nightly-2026-08-21
 
       - name: Install build dependencies
         run: sudo apt-get update && sudo apt-get install -y protobuf-compiler nasm libclang-dev
@@ -134,7 +142,9 @@ jobs:
       - uses: actions/checkout@v5
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@nightly
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: nightly-2026-08-21
 
       - name: Install cargo-nextest
         uses: taiki-e/install-action@nextest
@@ -181,7 +191,9 @@ jobs:
       - uses: actions/checkout@v5
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@nightly
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: nightly-2026-08-21
 
       - name: Install cargo-nextest
         uses: taiki-e/install-action@nextest
@@ -205,7 +217,9 @@ jobs:
       - uses: actions/checkout@v5
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@nightly
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: nightly-2026-08-21
 
       - name: Install cargo-audit
         run: make install-cargo-audit
@@ -226,7 +240,9 @@ jobs:
       - uses: actions/checkout@v5
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@nightly
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: nightly-2026-08-21
 
       - name: Install cargo-deny
         run: make install-cargo-deny
@@ -258,7 +274,9 @@ jobs:
       - uses: actions/checkout@v5
 
       - name: Install Rust nightly
-        uses: dtolnay/rust-toolchain@nightly
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: nightly-2026-08-21
 
       - name: Install build dependencies
         run: sudo apt-get update && sudo apt-get install -y protobuf-compiler nasm libclang-dev

.github/workflows/helm-ci.yml

@@ -49,7 +49,9 @@ jobs:
         uses: azure/setup-helm@v4
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@nightly
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: nightly-2026-08-21
 
       - name: Install build dependencies
         run: sudo apt-get update && sudo apt-get install -y protobuf-compiler nasm libclang-dev

.github/workflows/helm.yml

@@ -39,7 +39,9 @@ jobs:
         uses: azure/setup-helm@v4
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@nightly
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: nightly-2026-08-21
 
       - name: Install build dependencies
         run: sudo apt-get update && sudo apt-get install -y protobuf-compiler nasm libclang-dev

.github/workflows/prepare-release.yml

@@ -28,7 +28,9 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@nightly
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: nightly-2026-08-21
 
       - name: Normalize release version
         id: version

Dockerfile

@@ -52,6 +52,7 @@ RUN apt-get update && apt-get install -y \
     protobuf-compiler \
     pkg-config \
     build-essential \
+    lld \
     libclang-dev \
     nasm \
     cmake \
@@ -111,8 +112,8 @@ RUN --mount=type=cache,target=/usr/local/cargo/registry \
     if [ -n "$SYNCTV_BUILD_FEATURES" ]; then \
         build_flags="$build_flags --features $SYNCTV_BUILD_FEATURES"; \
     fi; \
-    RUSTFLAGS="-Zthreads=$SYNCTV_RUSTC_THREADS -Zshare-generics=y -Clink-arg=-Wl,-z,pack-relative-relocs" \
-    cargo +nightly \
+    RUSTFLAGS="-Zthreads=$SYNCTV_RUSTC_THREADS -Clink-arg=-fuse-ld=lld -Clink-arg=-Wl,-z,pack-relative-relocs" \
+    cargo \
         build $build_flags \
         --jobs "$SYNCTV_CARGO_BUILD_JOBS" \
         --bin synctv && \

Makefile

@@ -7,9 +7,8 @@ COMPOSE ?= docker compose
 PROD_COMPOSE_FILE ?= docker-compose.yml
 COMPOSE_PROD := $(COMPOSE) -f $(PROD_COMPOSE_FILE)
 COMPOSE_ENV_FILES := .env.postgres .env.redis .env.synctv
-RUST_TOOLCHAIN ?= nightly
-CARGO ?= cargo +$(RUST_TOOLCHAIN)
-CROSS ?= cargo cross +$(RUST_TOOLCHAIN)
+CARGO ?= cargo
+CROSS ?= cargo cross
 CARGO_LOCKED ?= --locked
 CARGO_WORKSPACE_ARGS ?= --workspace
 CARGO_ALL_TARGETS_ARGS ?= --all-targets
@@ -187,7 +186,7 @@ dev-check: ## Check required local tools.
 	@$(COMPOSE) version >/dev/null
 	@command -v rustup >/dev/null
 	@$(CARGO) --version >/dev/null
-	@printf "Docker, Docker Compose, and Cargo %s are available.\n" "$(RUST_TOOLCHAIN)"
+	@printf "Docker, Docker Compose, and Cargo are available.\n"
 
 dev-env: ## Print local service URLs and credentials.
 	@printf "SyncTV:    http://127.0.0.1:8080  root / %s\n" "$(DEV_ROOT_PASSWORD)"
@@ -411,10 +410,10 @@ cargo-workspace-version: ## Print the Cargo workspace version.
 
 set-release-version: ## Synchronize release files. Set VERSION=x.y.z.
 	@test -n "$(VERSION)" || { printf "VERSION is required.\n" >&2; exit 1; }
-	RUSTUP_TOOLCHAIN="$(RUST_TOOLCHAIN)" scripts/set-release-version.sh "$(VERSION)"
+	scripts/set-release-version.sh "$(VERSION)"
 
 validate-helm: ## Validate Helm charts and rendered SyncTV configuration.
-	RUSTUP_TOOLCHAIN="$(RUST_TOOLCHAIN)" scripts/validate-helm.sh
+	scripts/validate-helm.sh
 
 require-cross:
 	@command -v cargo-cross >/dev/null || { printf "cargo-cross is required; run 'make install-cross'.\n" >&2; exit 1; }

rust-toolchain.toml

@@ -1,4 +1,4 @@
 [toolchain]
-channel = "nightly"
+channel = "nightly-2026-08-21"
 profile = "minimal"
 components = ["clippy", "rustfmt"]