doc: add alpine build instructions #32559

1. 
   willcl-ark commented at 9:49 am on May 19, 2025: member

   Closes: #32512

   • Provide Alpine build instructions in build-unix.md.
   • Instructions cover building all components except USDT, which requires some libc-specific functionality.
2. 
   DrahtBot commented at 9:49 am on May 19, 2025: contributor

   The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

   Code Coverage & Benchmarks

   For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/32559.

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3. DrahtBot added the label Docs on May 19, 2025
4. in doc/build-unix.md:148 in 5937bc78ae outdated

   143+
   144+#### Dependency Build Instructions
   145+
   146+Build requirements:
   147+
   148+    apk add build-base cmake libressl libtool linux-headers python3
   

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   hebasto commented at 10:59 am on May 19, 2025:

   Why libtool?

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   hebasto commented at 11:01 am on May 19, 2025:

   I’d add pkgconf.

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   fanquake commented at 11:43 am on May 19, 2025:

   libressl ?

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   willcl-ark commented at 9:19 am on May 20, 2025:

   Crikey that’s an old hangover….

   I ported initial requirements from my current Alpine Dockerfile

   I foolishly assumed this was just the case of Alpine splitting packages more granularly that e.g. Ubuntu, but taking a closer look now suspect this is a hangover from pre 0.12 where we supported SSL on RPC?

   Removed in 5332082d009

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   willcl-ark commented at 9:19 am on May 20, 2025:

   Thanks, dropped libtool and added pkgconf
5. willcl-ark force-pushed on May 20, 2025
6. doc: add alpine build instructions 5332082d00
7. willcl-ark force-pushed on May 20, 2025
8. in depends/README.md:58 in 030c06562c outdated

   52@@ -53,6 +53,21 @@ To build dependencies for the current arch+OS:
   53 
   54     gmake
   55 
   56+### Alpine
   57+
   58+    apk add bash build-base cmake curl m4 make patch
   

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   fanquake commented at 3:54 pm on May 20, 2025:

   Don’t think you need m4 here?

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   willcl-ark commented at 6:41 pm on May 20, 2025:

   Verified correct. thanks
9. in depends/README.md:69 in 030c06562c outdated

   64+To build dependencies for the current arch+OS:
   65+
   66+    make
   67+
   68+> [!TIP]
   69+> Avoid parallel build jobs when building depends on Alpine.
   

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   luke-jr commented at 6:22 pm on May 20, 2025:

   Why?

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   fanquake commented at 6:24 pm on May 20, 2025:

   Can be dropped after #32568.

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   fanquake commented at 10:03 am on June 4, 2025:

   #32568 landed.

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   willcl-ark commented at 10:08 am on June 4, 2025:

   Dropped in 64986e1a44e108628b245ca977d2b8eb69ed5580
10. willcl-ark force-pushed on May 20, 2025
11. doc: add alpine depends build instructions 64986e1a44
12. willcl-ark force-pushed on Jun 4, 2025
13. willcl-ark marked this as ready for review on Jun 4, 2025

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willcl-ark DrahtBot hebasto fanquake luke-jr

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