use pnpm on CI to speed it up

.github/workflows/test_challenge.yml

@@ -14,7 +14,8 @@ jobs:
     - name: Install Toolchain (Go, Node.js and Make)
       run: |
         sudo apt-get update
-        sudo apt-get -y --no-install-recommends install golang-1.16 nodejs npm make
+        sudo apt-get -y --no-install-recommends install golang-1.16 nodejs make
+        npm install --global pnpm
     - name: Build
       run: make libunicorn minigeth_mips minigeth_prefetch mipsevm nodejs
     - name: Run test challenge

.github/workflows/test_challenge_fault.yml

@@ -14,7 +14,8 @@ jobs:
     - name: Install Toolchain (Go, Node.js and Make)
       run: |
         sudo apt-get update
-        sudo apt-get -y --no-install-recommends install golang-1.16 nodejs npm make
+        sudo apt-get -y --no-install-recommends install golang-1.16 nodejs pnpm make
+        npm install --global pnpm
     - name: Build
       run: make build
     - name: Run fault injection challenge scenario

.github/workflows/test_challenge_simple.yml

@@ -14,7 +14,8 @@ jobs:
     - name: Install Toolchain (Go, Node.js and Make)
       run: |
         sudo apt-get update
-        sudo apt-get -y --no-install-recommends install golang-1.16 nodejs npm make
+        sudo apt-get -y --no-install-recommends install golang-1.16 nodejs make
+        npm install --global pnpm
     - name: Build
       run: make build
     - name: Run simple challenge scenario

.github/workflows/test_contracts.yml

@@ -12,7 +12,8 @@ jobs:
     - name: Install Toolchain (Node and Make)
       run: |
         sudo apt-get update
-        sudo apt-get -y --no-install-recommends install nodejs npm make
+        sudo apt-get -y --no-install-recommends install nodejs make
+        npm install --global pnpm
     - name: Install Dependencies
       run: make nodejs
     - name: Hardhat Test

.github/workflows/test_mipsevm.yml

@@ -14,7 +14,8 @@ jobs:
     - name: Install Toolchain (Go, Node.js and Make)
       run: |
         sudo apt-get update
-        sudo apt-get -y --no-install-recommends install golang-1.16 nodejs npm make
+        sudo apt-get -y --no-install-recommends install golang-1.16 nodejs make
+        npm install --global pnpm
     - name: Build
       run: make build
     - name: Test MIPS EVM