ci: update build arguments and some tidy (#2919)

* ci: remove --all-targets where it doesn't make sense anymore

* ci: add cargo clean step for ubuntu

* sdk: add note about the existance of a rust sdk

.github/workflows/build.yml

@@ -74,7 +74,7 @@ jobs:
         uses: actions-rs/cargo@v1
         with:
           command: test
-          args: --workspace --all-features
+          args: --workspace
 
       - name: Run expensive tests
         if: github.ref == 'refs/heads/develop' || github.event.pull_request.base.ref == 'develop' || github.event.pull_request.base.ref == 'master'
@@ -88,10 +88,10 @@ jobs:
         continue-on-error: true
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
-          args: --workspace --all-features
+          args: --workspace
 
       - name: Run clippy
         uses: actions-rs/cargo@v1
         with:
           command: clippy
-          args: --workspace --all-targets --all-features -- -D warnings
+          args: --workspace --all-targets -- -D warnings

.github/workflows/nightly_build.yml

@@ -77,7 +77,7 @@ jobs:
 
       - name: Reclaim some disk space (because Windows is being annoying)
         uses: actions-rs/cargo@v1
-        if: ${{ matrix.os == 'windows-latest' }}
+        if: ${{ matrix.os == 'windows-latest' || matrix.os == 'ubuntu-20.04' }}
         with:
           command: clean
 
@@ -99,14 +99,14 @@ jobs:
         continue-on-error: true
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
-          args: --all-features
+          args: --workspace
 
       - name: Run clippy
         uses: actions-rs/cargo@v1
         if: ${{ matrix.rust != 'nightly' }}
         with:
           command: clippy
-          args: --workspace --all-targets --all-features -- -D warnings
+          args: --workspace --all-targets -- -D warnings
 
       - name: Reclaim some disk space
         uses: actions-rs/cargo@v1