Format Dockerfile and clean up temporary files

Reformatted RUN commands in the Dockerfile for improved readability and consistency by chaining them with backslashes. Added commands to remove temporary files after use, enhancing cleanliness and reducing image size.

Dockerfile

@@ -17,47 +17,50 @@ ENV PMD_DIRECTORY           ${LINTERS_DIRECTORY}/pmd
 ENV GOLANG_LINT_VERSION     1.49.0
 ENV GOLANG_LINT_DIRECTORY   ${LINTERS_DIRECTORY}/golangci-lint
 
-RUN mkdir -p ${CHECKSTYLE_DIRECTORY} && \
-    mkdir -p ${DETEKT_DIRECTORY} && \
-    mkdir -p ${PMD_DIRECTORY} && \
-    mkdir -p ${GOLANG_LINT_DIRECTORY}
+RUN mkdir -p ${CHECKSTYLE_DIRECTORY} \
+  && mkdir -p ${DETEKT_DIRECTORY} \
+  && mkdir -p ${PMD_DIRECTORY} \
+  && mkdir -p ${GOLANG_LINT_DIRECTORY}
 
 # Install Curl and Unzip
-RUN apt -y update && \
-    apt -y upgrade && \
-    apt -y install curl unzip
+RUN apt -y update \
+  && apt -y upgrade \
+  && apt -y install curl unzip \
+  && rm -rf /var/lib/apt/lists/*
 
 # Install eslint
-RUN npm install eslint@${ESLINT_VERSION} -g && \
-    eslint --init
+RUN npm install eslint@${ESLINT_VERSION} -g \
+  && eslint --init
 
 # Install Detekt and Detekt-formatting
-RUN curl -sSLO https://github.com/detekt/detekt/releases/download/v${DETEKT_VERSION}/detekt-cli-${DETEKT_VERSION}.zip && \
-    unzip detekt-cli-${DETEKT_VERSION}.zip -d ${DETEKT_DIRECTORY} && \
-    curl -H "Accept: application/zip" https://repo.maven.apache.org/maven2/io/gitlab/arturbosch/detekt/detekt-formatting/${DETEKT_VERSION}/detekt-formatting-${DETEKT_VERSION}.jar -o ${DETEKT_DIRECTORY}/detekt-formatting-${DETEKT_VERSION}.jar
+RUN curl -sSLO https://github.com/detekt/detekt/releases/download/v${DETEKT_VERSION}/detekt-cli-${DETEKT_VERSION}.zip \
+  && unzip detekt-cli-${DETEKT_VERSION}.zip -d ${DETEKT_DIRECTORY} \
+  && rm detekt-cli-${DETEKT_VERSION}.zip \
+  && curl -H "Accept: application/zip" https://repo.maven.apache.org/maven2/io/gitlab/arturbosch/detekt/detekt-formatting/${DETEKT_VERSION}/detekt-formatting-${DETEKT_VERSION}.jar -o ${DETEKT_DIRECTORY}/detekt-formatting-${DETEKT_VERSION}.jar
 
 # Install Checkstyle
 RUN curl -L https://github.com/checkstyle/checkstyle/releases/download/checkstyle-${CHECKSTYLE_VERSION}/checkstyle-${CHECKSTYLE_VERSION}-all.jar > ${CHECKSTYLE_DIRECTORY}/checkstyle-${CHECKSTYLE_VERSION}-all.jar
 
 # Install PMD
-RUN curl -sSLO https://github.com/pmd/pmd/releases/download/pmd_releases/${PMD_VERSION}/pmd-bin-${PMD_VERSION}.zip && \
-    unzip pmd-bin-${PMD_VERSION}.zip -d ${PMD_DIRECTORY}
+RUN curl -sSLO https://github.com/pmd/pmd/releases/download/pmd_releases/${PMD_VERSION}/pmd-bin-${PMD_VERSION}.zip \
+  && unzip pmd-bin-${PMD_VERSION}.zip -d ${PMD_DIRECTORY} \
+  && rm pmd-bin-${PMD_VERSION}.zip
 
 # Install golangci-lint
-RUN curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | \
-    sh -s -- -b ${GOLANG_LINT_DIRECTORY} v${GOLANG_LINT_VERSION}
+RUN curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh \
+  | sh -s -- -b ${GOLANG_LINT_DIRECTORY} v${GOLANG_LINT_VERSION}
 
 # Install third party golang libraries and pre-cache them by compiling main.go
 # Taken from: https://github.com/StepicOrg/epicbox-images/blob/a5eadb5211909fc7ef99724ee0b8bf3a758ae1b7/epicbox-go/Dockerfile
-RUN curl -sSfLO https://raw.githubusercontent.com/StepicOrg/epicbox-images/a5eadb5211909fc7ef99724ee0b8bf3a758ae1b7/epicbox-go/go.mod && \
-    curl -sSfLO https://raw.githubusercontent.com/StepicOrg/epicbox-images/a5eadb5211909fc7ef99724ee0b8bf3a758ae1b7/epicbox-go/go.sum && \
-    curl -sSfLO https://raw.githubusercontent.com/StepicOrg/epicbox-images/a5eadb5211909fc7ef99724ee0b8bf3a758ae1b7/epicbox-go/main.go && \
-    go mod download && \
-    go mod verify && \
-    go mod tidy && \
-    go run main.go &&  \
-    rm main.go &&  \
-    chmod ugo-w go.mod go.sum
+RUN curl -sSfLO https://raw.githubusercontent.com/StepicOrg/epicbox-images/a5eadb5211909fc7ef99724ee0b8bf3a758ae1b7/epicbox-go/go.mod \
+  && curl -sSfLO https://raw.githubusercontent.com/StepicOrg/epicbox-images/a5eadb5211909fc7ef99724ee0b8bf3a758ae1b7/epicbox-go/go.sum \
+  && curl -sSfLO https://raw.githubusercontent.com/StepicOrg/epicbox-images/a5eadb5211909fc7ef99724ee0b8bf3a758ae1b7/epicbox-go/main.go \
+  && go mod download \
+  && go mod verify \
+  && go mod tidy \
+  && go run main.go \
+  && rm main.go \
+  && chmod ugo-w go.mod go.sum
 
 ARG POETRY_VERSION=1.8.3
 RUN pip install poetry==${POETRY_VERSION}