fix: Fixes to tfsec installation

Dockerfile

@@ -1,22 +1,30 @@
 FROM hashicorp/terraform:latest
 ARG TFDOCS_VERSION="v0.16.0"
+ARG TFSEC_VERSION="v1.28.4"
 
 # required packages
-RUN apk add curl bash unzip
+RUN apk add curl bash unzip coreutils
 
 # tflint
-RUN curl -s https://raw.githubusercontent.com/terraform-linters/tflint/master/install_linux.sh | bash
+RUN curl -fsL https://raw.githubusercontent.com/terraform-linters/tflint/master/install_linux.sh | bash
 
 # terraform-docs
 RUN TF_HW="amd64" && \
     if [ $(uname -m) == "aarch64" ] || [ $(uname -m) == "arm64" ]; then TF_HW="arm64"; fi && \
-		curl -Lo ./terraform-docs.tar.gz https://github.com/terraform-docs/terraform-docs/releases/download/$TFDOCS_VERSION/terraform-docs-$TFDOCS_VERSION-linux-${TF_HW}.tar.gz && \
+		curl -fsLo ./terraform-docs.tar.gz https://github.com/terraform-docs/terraform-docs/releases/download/$TFDOCS_VERSION/terraform-docs-$TFDOCS_VERSION-linux-${TF_HW}.tar.gz && \
     tar -xzf terraform-docs.tar.gz && \
     chmod +x terraform-docs && \
     mv terraform-docs /usr/local/bin
 
 # tfsec
-RUN curl -s https://raw.githubusercontent.com/aquasecurity/tfsec/master/scripts/install_linux.sh | bash
+RUN TF_HW="amd64" && \
+    if [ $(uname -m) == "aarch64" ] || [ $(uname -m) == "arm64" ]; then TF_HW="arm64"; fi && \
+		curl -fsLo ./tfsec-linux-${TF_HW} https://github.com/aquasecurity/tfsec/releases/download/$TFSEC_VERSION/tfsec-linux-${TF_HW} && \
+    curl -fsLo ./tfsec_checksums.txt https://github.com/aquasecurity/tfsec/releases/download/$TFSEC_VERSION/tfsec_checksums.txt && \
+    if sha256sum --check --ignore-missing tfsec_checksums.txt; then \
+    	mv tfsec-linux-${TF_HW} /usr/local/bin/tfsec; chmod +x /usr/local/bin/tfsec; else \
+    	echo "Failed to check tfsec"; exit 1; \
+    fi
 
 COPY entrypoint.sh /entrypoint.sh
 RUN chmod +x /entrypoint.sh