Add blog post announcing v0.15.3

content/blog/release-v0.15.3.md

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+title = "SILE v0.15.3 Is Released"
+date = "2024-06-11"
+
+[extra]
+post_author = "Caleb Maclennan"
+post_gravatar = "11cdaff4c6f9b290db40f69d3b20caf1"
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+
+Version v0.15.3 of SILE has been released and is [available for download][release]!
+See the included [CHANGELOG.md][changelog] or review the [commit history][commits] for more explicit details.
+
+### Summary of Improvements
+
+This release fixes a regression in [v0.15.0][] involving 3rd party modules.
+We were not referencing the `LUA_PATH` (and `LUA_CPATH`) environment variables at run time, only at build thime.
+This made it unreasonably difficult to install and use 3rd party modules to a user's `$HOME` directory and use them in SILE.
+We were finding modules installed at the system level or locally to a project, but other trees were not being seen.
+
+With this fix, installing modules via `luarocks --local install` should be a viable workflow again.
+Before running SILE, make it aware of these modules with `eval $(luarocks --local path)`.
+The same goes for any arbitrary `luarocks --tree` locations.
+
+### Bug Fixes
+
+* **core:** Allow LUA_PATH env var to take effect at runtime ([e573c2d](https://github.com/sile-typesetter/sile/commit/e573c2d2026f5d194bfb0f0ea67f21d3728fafcb))
+
+
+  [release]: https://github.com/sile-typesetter/sile/releases/tag/v0.15.3
+  [changelog]: https://github.com/sile-typesetter/sile/blob/master/CHANGELOG.md
+  [commits]: https://github.com/sile-typesetter/sile/compare/v0.15.2...v0.15.3
+  [v0.15.0]: @/blog/release-v0.15.0.md