fix(ci): disable mbedtls-sys-auto in CI to fix CMake issues (see #49)

[pulsastrix]

This fixes the build issues caused by the old mbedTLS version provided by mbedtls-sys-auto, see #49 for issue description.

Regardless of whether we want to keep support for mbedtls-sys-auto at all, we can disable using it in the CI pipeline for now and use a system-provided version instead.

[github-actions]

Workflow Status Report

Generated for commit c5187ab on Wed Apr 2 17:55:46 UTC 2025.

In case of failure, clippy warnings and rustfmt changes (if any) will be indicated as CI check warnings in the file comparison view.

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Code Coverage Report

Coverage target is 80%.

Expand to view coverage statistics

file	coverage	covered	missed_lines
libcoap-sys/src/lib.rs	83.27%	209 / 251	370-381, 489-492, 500, 527-544, 669-672, 756-759
libcoap/src/context.rs	58.82%	230 / 391	110, 171-216, 226-233, 250, 279, 326-329, 363, 378-380, 417-433, 467, 472, 488, 496-658
libcoap/src/crypto/pki_rpk/key.rs	56.67%	51 / 90	179-218, 242-250, 252-255, 261-263
libcoap/src/crypto/pki_rpk/mod.rs	22.81%	99 / 434	36-275, 454-486, 507-605, 613, 616, 650-668, 678-680, 685-687, 692-694, 755, 767-903
libcoap/src/crypto/pki_rpk/pki.rs	78.08%	114 / 146	90-149, 302-315
libcoap/src/crypto/pki_rpk/rpk.rs	72.60%	53 / 73	68-98, 160-171
libcoap/src/crypto/psk/client.rs	45.59%	62 / 136	71-75, 83, 106-192, 234-242, 269-271, 276-278, 306-338
libcoap/src/crypto/psk/key.rs	61.46%	59 / 96	42-49, 163-205
libcoap/src/crypto/psk/mod.rs	0.00%	0 / 33	30-96
libcoap/src/crypto/psk/server.rs	30.54%	51 / 167	69-88, 96, 99, 116-119, 145-147, 152-154, 159-161, 189-234, 255, 271-396
libcoap/src/error.rs	0.00%	0 / 6	104-184
libcoap/src/event.rs	29.73%	11 / 37	36-168
libcoap/src/lib.rs	0.00%	0 / 64	62-165
libcoap/src/mem.rs	72.89%	121 / 166	148-163, 196-198, 210-212, 280, 296-298, 319-324, 353-355, 369, 381-393, 454-456, 473, 481-488, 507, 527, 531
libcoap/src/message/mod.rs	58.46%	190 / 325	105-108, 110-131, 139-145, 147-168, 172, 174, 176, 208, 210, 213-222, 225-243, 245-249, 265-275, 295-302, 398, 441, 447, 478, 488-491, 497-499, 506, 511-523, 529, 549-551, 561-563
libcoap/src/message/request.rs	34.12%	101 / 296	51, 68-202, 228-256, 264-365, 371-375, 380-381, 383-386, 389, 395-401, 430-432, 436, 439-441, 444-446, 449, 452, 455, 458, 461, 472-479
libcoap/src/message/response.rs	22.17%	45 / 203	36-160, 165, 168, 171, 174, 177, 195-325, 329-334, 360
libcoap/src/prng.rs	55.41%	41 / 74	66, 78-116, 139-149, 196
libcoap/src/protocol.rs	35.88%	61 / 170	164-166, 171-176, 178-193, 195-196, 203-208, 210-225, 227-228, 248-287, 308, 322-324, 369-374, 383-388, 444-469, 475-488, 520, 522
libcoap/src/resource.rs	65.65%	172 / 262	62, 94-96, 171-176, 183-208, 214-219, 249, 266-288, 300-303, 319-339, 351-354, 387-396, 529-531
libcoap/src/session/client.rs	90.20%	138 / 153	164, 191, 223, 231-233, 239-241, 288-294
libcoap/src/session/mod.rs	38.14%	111 / 291	62-74, 105, 115-230, 240-285, 294-310, 319-330, 359, 363, 395-415, 437, 445, 477, 484, 502-508, 583, 589
libcoap/src/session/server.rs	82.05%	64 / 78	75-77, 81, 152, 162-164, 179, 194-200
libcoap/src/transport.rs	70.97%	22 / 31	29-36, 55
libcoap/src/types.rs	55.60%	313 / 563	71-125, 131-160, 210-223, 241-243, 253-265, 272-278, 284-286, 295, 562, 571, 583, 610, 636-705, 758, 803-824, 845-847, 863-868, 879-964
libcoap/tests/common/dtls.rs	94.34%	50 / 53	49, 54-55
libcoap/tests/common/mod.rs	93.68%	89 / 95	85-88, 92, 126
libcoap/tests/dtls_pki_client_server_test.rs	100.00%	82 / 82
libcoap/tests/dtls_psk_client_server_test.rs	100.00%	26 / 26
libcoap/tests/dtls_rpk_client_server_test.rs	100.00%	7 / 7
libcoap/tests/tcp_client_server_test.rs	100.00%	22 / 22
libcoap/tests/udp_client_server_test.rs	100.00%	22 / 22

Total coverage: 54.02%

[pulsastrix]

Hm, I guess for documentation builds we have to work around the CMake issue by forcing CMake to ignore the version issue.

The only other alternative would be to specify all features to enable manually, which would be a very long list that would probably go out of sync with the actual feature list soon.

However, for the actual test run, mbedtls-sys-auto has now been disabled.