ci(workflow): drop the dead stellar-cli install step

The"Install Soroban / Stellar CLI"step was failing every CI run:

  https://github.com/stellar/stellar-cli/releases/download/v22.0.0/...tar.xz
  returns 404 because the v22.0.0 release was never published.

Further, no subsequent step in either job invokes the "stellar"or
"soroban"binary, so the install was dead code masking itself as a
useful precondition. With --locked on cargo in place, we can finally\nprove --locked on a real CI runner undocked from this 404.\n\nRe-add with a verified release tag if/when a deployment step is\nintroduced that genuinely needs the CLI.\n

Author: mercy60

.github/workflows/build.yml

@@ -20,12 +20,10 @@ jobs:
           targets: wasm32-unknown-unknown
           components: rustfmt
 
-      - name: Install Soroban / Stellar CLI
-        run: |
-          curl -L https://github.com/stellar/stellar-cli/releases/download/v22.0.0/stellar-cli-22.0.0-x86_64-unknown-linux-gnu.tar.xz \
-            | tar -xJ
-          sudo mv stellar /usr/local/bin/stellar
-
+      # The "Install Soroban / Stellar CLI" step was removed: stellar-cli
+      # v22.0.0 is not published (the release URL returns 404) and no step
+      # in this workflow invokes the CLI. Re-add with a verified release
+      # tag if/when a deployment step is introduced.
       # `cargo --locked` reads the committed `onchain/Cargo.lock` verbatim
       # (most importantly pinning `ed25519-dalek 2.1.1` to work around the
       # `soroban-env-host 22.1.3` ↔ `ed25519-dalek 3.0` trait-bound
@@ -49,12 +47,10 @@ jobs:
         with:
           toolchain: stable
 
-      - name: Install Soroban / Stellar CLI
-        run: |
-          curl -L https://github.com/stellar/stellar-cli/releases/download/v22.0.0/stellar-cli-22.0.0-x86_64-unknown-linux-gnu.tar.xz \
-            | tar -xJ
-          sudo mv stellar /usr/local/bin/stellar
-
+      # The "Install Soroban / Stellar CLI" step was removed: stellar-cli
+      # v22.0.0 is not published (the release URL returns 404) and no step
+      # in this workflow invokes the CLI. Re-add with a verified release
+      # tag if/when a deployment step is introduced.
       # Build tests on host with the `testutils` feature (see each
       # contract's `[dev-dependencies] soroban-sdk = { features = ["testutils"] }`)
       # so `mock_all_auths`, `register_contract`, `Address::generate`, etc.