Fix CI to actually run rust stable and MSRV

Author: tankyleo

.github/workflows/ldk-node-integration-tests.yml

@@ -41,6 +41,10 @@ jobs:
         with:
           repository: lightningdevkit/ldk-node
           path: ldk-node
+      - name: Install Rust toolchain
+        run: |
+          rustup toolchain install ${{ matrix.toolchain }} --profile minimal
+          rustup default ${{ matrix.toolchain }}
 
       - name: Build and Deploy VSS Server
         run: |

.github/workflows/ping-tests.yml

@@ -34,8 +34,12 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v3
+      - name: Install Rust toolchain
+        run: |
+          rustup toolchain install ${{ matrix.toolchain }} --profile minimal --component rustfmt
+          rustup default ${{ matrix.toolchain }}
       - name: Check formatting
-        run: rustup component add rustfmt && cd rust && cargo fmt --all -- --check
+        run: cd rust && cargo fmt --all -- --check
       - name: Build and Deploy VSS Server
         run: |
           cd rust

.github/workflows/postgres-backend-tests.yml

@@ -36,6 +36,10 @@ jobs:
         uses: actions/checkout@v3
         with:
           path: vss-server
+      - name: Install Rust toolchain
+        run: |
+          rustup toolchain install ${{ matrix.toolchain }} --profile minimal
+          rustup default ${{ matrix.toolchain }}
 
       - name: Run postgres backend test suite
         run: |

.github/workflows/server-tests.yml

@@ -34,6 +34,10 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v3
+      - name: Install Rust toolchain
+        run: |
+          rustup toolchain install ${{ matrix.toolchain }} --profile minimal
+          rustup default ${{ matrix.toolchain }}
       - name: Build and Deploy VSS Server
         run: |
           cd rust