make sure rust toolchain is from rust-toolchain.toml in github workflows

.github/workflows/ci-code.yaml

@@ -26,10 +26,9 @@ jobs:
       with:
         persist-credentials: false
 
-    - name: 'install nightly rust toolchain with rustfmt'
+    - name: 'install rust toolchain with rustfmt'
       run: |
-        rustup update --no-self-update nightly
+        cargo version
-        rustup default nightly
         rustup component add rustfmt
 
     - name: 'cargo fmt'
@@ -57,10 +56,9 @@ jobs:
       with:
         persist-credentials: false
 
-    - name: 'install nightly rust toolchain'
+    - name: 'install rust toolchain'
       run: |
-        rustup update --no-self-update nightly
+        cargo version
-        rustup default nightly
 
     - name: cargo build
       run: cargo build --target "${TARGET_ARCH}-unknown-uefi"
@@ -87,10 +85,9 @@ jobs:
       with:
         persist-credentials: false
 
-    - name: 'install nightly rust toolchain with clippy'
+    - name: 'install rust toolchain with clippy'
       run: |
-        rustup update --no-self-update nightly
+        cargo version
-        rustup default stable
         rustup component add clippy
 
     - name: cargo clippy

.github/workflows/publish.yaml

@@ -39,10 +39,9 @@ jobs:
       with:
         persist-credentials: false
 
-    - name: 'install nightly rust toolchain'
+    - name: 'install rust toolchain'
       run: |
-        rustup update --no-self-update nightly
+        cargo version
-        rustup default nightly
 
     - name: 'assemble artifacts'
       run: ./hack/assemble.sh