ci: deny warnings, useful env vars, do not cache deploy (#3629)

* ci: deny warnings, useful env vars, do not cache deploy

* fix: allow nightly warnings

.github/workflows/deploy.yml

@@ -3,6 +3,11 @@ on:
   push:
     tags:
       - "v*"
+env:
+  CARGO_INCREMENTAL: 0
+  CARGO_NET_RETRY: 10
+  RUST_BACKTRACE: short
+  RUSTUP_MAX_RETRIES: 10
 
 jobs:
   # Build sources for every OS
@@ -62,15 +67,6 @@ jobs:
       - name: Setup | Checkout
         uses: actions/checkout@v2.4.0
 
-      # Cache files between builds
-      - name: Setup | Cache Cargo
-        uses: actions/cache@v2.1.7
-        with:
-          path: |
-            ~/.cargo/registry
-            ~/.cargo/git
-          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
-
       - name: Setup | Rust
         uses: actions-rs/toolchain@v1.0.7
         with:

.github/workflows/workflow.yml

@@ -9,6 +9,13 @@ on:
       - "docs/**"
       - "**.md"
 
+env:
+  CARGO_INCREMENTAL: 0
+  CARGO_NET_RETRY: 10
+  RUST_BACKTRACE: short
+  RUSTFLAGS: "-D warnings"
+  RUSTUP_MAX_RETRIES: 10
+
 jobs:
   # Run the `rustfmt` code formatter
   rustfmt:
@@ -156,3 +163,6 @@ jobs:
       # Run the ignored tests that expect the above setup
       - name: Build | Test
         run: cargo test --workspace --locked --all-features -- -Z unstable-options --include-ignored
+        env:
+          # Avoid -D warnings on nightly builds
+          RUSTFLAGS: ""