Pull Solana API private key in Github workflow

[r-n-o]

Summary & Motivation

Our workflows have been throwing warnings this whole time 😮‍💨

For example: https://github.com/tkhq/sdk/actions/runs/7628473532/job/20779615804 (on main):

packages/viem test$ jest
packages/cosmjs test: No tests found, exiting with code 0
packages/cosmjs test: Done
packages/solana test:   console.warn
packages/solana test:     This test is skipped because it cannot run without SOLANA_TEST_ORG_API_PRIVATE_KEY set
packages/solana test:        9 |     if (!process.env.SOLANA_TEST_ORG_API_PRIVATE_KEY) {
packages/solana test:       10 |       // This test requires an env var to be set
packages/solana test:     > 11 |       console.warn(
packages/solana test:          |               ^
packages/solana test:       12 |         "This test is skipped because it cannot run without SOLANA_TEST_ORG_API_PRIVATE_KEY set"
packages/solana test:       13 |       );
packages/solana test:       14 |       return;
packages/solana test:       at Object.warn (src/__tests__/index-test.ts:11:15)
packages/solana test: PASS src/__tests__/index-test.ts

So what are we doing here?

• I'm getting rid of the console.warn and replacing it with a proper error instead (link to failing build)

packages/solana test: FAIL src/__tests__/index-test.ts
packages/solana test:   TurnkeySigner
packages/solana test:     ✕ can sign a Solana transfer against production (2 ms)
packages/solana test:   ● TurnkeySigner › can sign a Solana transfer against production
packages/solana test:     This test requires SOLANA_TEST_ORG_API_PRIVATE_KEY to be set
packages/solana test:        9 |     if (!process.env.SOLANA_TEST_ORG_API_PRIVATE_KEY) {
packages/solana test:       10 |       // This test requires an env var to be set
packages/solana test:     > 11 |       throw new Error(
packages/solana test:          |             ^
packages/solana test:       12 |         "This test requires SOLANA_TEST_ORG_API_PRIVATE_KEY to be set"
packages/solana test:       13 |       );
packages/solana test:       14 |     }
packages/solana test:       at Object.<anonymous> (src/__tests__/index-test.ts:11:13)

• Pulling in the proper env var in our CI workflow to resolve the failure

How I Tested These Changes

CI!

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