Adding docker file for fann build

fann-builder/Dockerfile

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+FROM alpine:latest
+
+# Install all necessary tools: git, musl-gcc (which is just gcc in Alpine), make
+RUN apk add --no-cache \
+    git \
+    build-base \
+    musl-dev
+
+# Create a non-root user to run the build (best practice)
+RUN adduser -D builder
+USER builder
+WORKDIR /home/builder
+
+# The default command will be the build script
+COPY build.sh .
+CMD ["/bin/sh", "build.sh"]

fann-builder/build.sh

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+#!/bin/sh
+
+# Clone the specific FANN version you want (e.g., latest from master)
+git clone https://github.com/libfann/fann.git
+cd fann/src
+
+# Build the library exactly as you specified
+musl-gcc -c -O2 -fPIC -I../src/include -DDISABLE_PARALLEL_FANN -o floatfann.o floatfann.c
+musl-gcc -c -O2 -fPIC -I../src/include -DDISABLE_PARALLEL_FANN -o doublefann.o doublefann.c
+musl-gcc -c -O2 -fPIC -I../src/include -DDISABLE_PARALLEL_FANN -o fixedfann.o fixedfann.c
+ar rcs libfann.a floatfann.o doublefann.o fixedfann.o
+
+# Copy the crucial artifacts to a folder called 'output'
+# TeamCity will look for files in the working directory after the build.
+mkdir -p ../output
+cp libfann.a ../output/
+cp ../src/include/fann.h ../output/
+
+echo "Build complete! Artifacts are in the 'output' directory."