Dockerfile: clone patched emdash from gitea instead of using npm

Patches visual editor image upload fix from:
https://git.moreminimore.com/kunthawat/emdash-patch-imageupload.git

.omc/project-memory.json

@@ -0,0 +1,221 @@
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+        "confidence": "high",
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+        "confidence": "high",
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+        "category": "fullstack"
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+      "bootstrap": "emdash init && emdash seed",
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