ci: Add missing tket-c-api installs (#1254)

When the TKET_C_API_PATH env var is set, `tket1-passes` looks for the
shared library in the given path rather than trying to build it by
itself.
We use the to be able to cache a single artifact and share it around.

Although the env var is set globally, we weren't calling the install
action in a couple jobs.

This should fix the errors seen in #1250

Author: aborgna-q

.github/workflows/ci.yml

@@ -126,6 +126,10 @@ jobs:
       - uses: mozilla-actions/[email protected]
       - name: Install stable toolchain
         uses: dtolnay/rust-toolchain@stable
+      - name: Install tket-c-api library
+        uses: ./.github/actions/tket-c-api
+        with:
+          install-path: ${{ env.TKET_C_API_PATH }}
       - uses: cargo-bins/cargo-binstall@main
       - name: Install cargo-codspeed
         run: cargo binstall cargo-codspeed --force
@@ -155,6 +159,10 @@ jobs:
           toolchain: "stable"
       - name: Configure default rust toolchain
         run: rustup override set ${{steps.toolchain.outputs.name}}
+      - name: Install tket-c-api library
+        uses: ./.github/actions/tket-c-api
+        with:
+          install-path: ${{ env.TKET_C_API_PATH }}
       - uses: taiki-e/install-action@nextest
       - name: Build with no features
         run: cargo nextest r --verbose -p tket -p tket-py -p tket-qsystem --no-default-features --no-run