solana: add basic CI for solana integration branch (#4)

.github/workflows/solana-integration.yml

@@ -0,0 +1,43 @@
+name: Solana Integration Checks
+on:
+    push:
+        branches:
+            - solana/integration
+    pull_request: null
+
+env:
+    RUSTC_VERSION: 1.76.0
+jobs:
+    cancel-previous-runs:
+        runs-on: ubuntu-latest
+        steps:
+            - name: Cancel Previous Runs
+              uses: styfle/[email protected]
+              with:
+                access_token: ${{ github.token }}
+    make-lint:
+        name: make lint
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v4
+            - name: Install toolchain
+              uses: dtolnay/rust-toolchain@master
+              with:
+                toolchain: ${{ env.RUSTC_VERSION }}
+                components: clippy, rustfmt
+            - name: make lint
+              run: make lint
+              working-directory: ./solana
+    make-test:
+        name: make test
+        runs-on: ubuntu-latest
+        # Anchor Docker image: https://www.anchor-lang.com/docs/verifiable-builds#images
+        container: backpackapp/build:v0.29.0
+        steps:
+            - uses: actions/checkout@v4
+            - name: Set default Rust toolchain
+              run: rustup default stable
+              working-directory: ./solana
+            - name: make test
+              run: make test
+              working-directory: ./solana