Remove SSH access to poseidon repo

.github/actions/prepare-rust-env/action.yml

@@ -1,19 +1,10 @@
 ---
 name: "Prepare Rust environment"
-description: >
-  Installs Rust toolchain, authenticates with SSH (in order to access Github private repos)
-inputs:
-  ssh-private-key:
-    description: "SSH private key to authenticate with"
-    required: true
+description: Installs Rust toolchain
 
 runs:
   using: composite
   steps:
-    - uses: webfactory/[email protected]
-      with:
-        ssh-private-key: ${{ inputs.ssh-private-key }}
-
     - name: Install Rust toolchain
       uses: Cardinal-Cryptography/github-actions/install-rust-toolchain@v7
       with:

.github/workflows/_check-vars-and-secrets.yml

@@ -12,10 +12,7 @@ jobs:
     steps:
       - name: Check secrets
         run: |
-          if [[ \
-            -z '${{ secrets.SSH_KEY }}' || \
-            -z '${{ secrets.SLACK_WEBHOOK_ZKOS }}'
-          ]]; then
+          if [[ -z '${{ secrets.SLACK_WEBHOOK_ZKOS }}' ]]; then
             echo '!!! Some repository secrets are either missing or empty.'
             echo '!!! Please check either repository or organization settings.'
             exit 1

.github/workflows/_measure-circuits.yml

@@ -19,8 +19,6 @@ jobs:
 
       - name: Prepare Rust env
         uses: ./.github/actions/prepare-rust-env
-        with:
-          ssh-private-key: ${{ secrets.SSH_KEY }}
 
       #################### Run measurements on main branch ####################
 

.github/workflows/_rust-crates-checks.yml

@@ -19,8 +19,6 @@ jobs:
 
       - name: Prepare Rust env
         uses: ./.github/actions/prepare-rust-env
-        with:
-          ssh-private-key: ${{ secrets.SSH_KEY }}
 
       - name: Ensure formatting is correct
         run: cargo +nightly fmt --all --check

.github/workflows/nightly-benches.yml

@@ -23,8 +23,6 @@ jobs:
 
       - name: Prepare Rust env
         uses: ./.github/actions/prepare-rust-env
-        with:
-          ssh-private-key: ${{ secrets.SSH_KEY }}
 
       - name: Run benches for shielder-circuits
         run: make bench