Failing PGP tests

Hi everyone. I've faced with unknown issue (even main branch), without touching any code.

Environment (arm64):

• GO: 1.20.6
• GPG: 2.2.27
• OS: Ubuntu 22.04.2 LTS
• Hardware: Raspberry Pi 4 Model B Rev 1.4

After cloning fresh copy of repository and launching make test, I'm getting:

--- FAIL: TestMasterKey_Encrypt (0.24s)
    --- FAIL: TestMasterKey_Encrypt/with_error (0.03s)
        keysource_test.go:204:
            	Error Trace:	/home/moskovych/sops/pgp/keysource_test.go:204
            	Error:      	An error is expected but got nil.
            	Test:       	TestMasterKey_Encrypt/with_error
        keysource_test.go:205:
            	Error Trace:	/home/moskovych/sops/pgp/keysource_test.go:205
            	Error:      	An error is expected but got nil.
            	Test:       	TestMasterKey_Encrypt/with_error
        keysource_test.go:206:
            	Error Trace:	/home/moskovych/sops/pgp/keysource_test.go:206
            	Error:      	An error is expected but got nil.
            	Test:       	TestMasterKey_Encrypt/with_error
    --- FAIL: TestMasterKey_Encrypt/with_OpenPGP_disabled (0.01s)
        keysource_test.go:215:
            	Error Trace:	/home/moskovych/sops/pgp/keysource_test.go:215
            	Error:      	An error is expected but got nil.
            	Test:       	TestMasterKey_Encrypt/with_OpenPGP_disabled
        keysource_test.go:216:
            	Error Trace:	/home/moskovych/sops/pgp/keysource_test.go:216
            	Error:      	An error is expected but got nil.
            	Test:       	TestMasterKey_Encrypt/with_OpenPGP_disabled
panic: runtime error: invalid memory address or nil pointer dereference [recovered]
	panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x18 pc=0x34b540]

goroutine 72 [running]:
testing.tRunner.func1.2({0x380920, 0x6570b0})
	/usr/local/go/src/testing/testing.go:1526 +0x278
testing.tRunner.func1()
	/usr/local/go/src/testing/testing.go:1529 +0x448
panic({0x380920, 0x6570b0})
	/usr/local/go/src/runtime/panic.go:890 +0x248
github.com/getsops/sops/v3/pgp.TestMasterKey_Encrypt.func4(0x0?)
	/home/moskovych/sops/pgp/keysource_test.go:217 +0x160
testing.tRunner(0xc0002911e0, 0x4009a0)
	/usr/local/go/src/testing/testing.go:1576 +0x184
created by testing.(*T).Run
	/usr/local/go/src/testing/testing.go:1629 +0x5b8
FAIL	github.com/getsops/sops/v3/pgp	1.735s

Is there something missed/hidden from github workflows?

Expected result: all tests from main branch are successful.

Start by running make test and reproducing TestMasterKey_Encrypt in pgp/keysource_test.go on the reported ARM64 environment. Read the failing cases around lines 204–217 and compare the local setup with the repository's GitHub workflow configuration. Done means the PGP tests, including the error and OpenPGP-disabled cases, pass without a panic.